Helmet
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B1 noun /ˈhel.mət/

Helmet

ヘルメット
Meaning
a hard or padded protective hat worn by motorcyclists, construction workers, or soldiers
Example
The cyclist always wore a bright yellow helmet for safety and visibility while riding.
サイクリストは常に安全性と視認性のために明るい黄色いヘルメットを着用していました。
C1 noun /ˈhed.weɪ/

Headway

進展; 前進; 発展
Meaning
forward movement or progress, especially when this is slow or difficult
Example
Despite the challenges, the research team made significant headway in developing the new vaccine.
挑戦にもかかわらず、研究チームは新しいワクチンの開発において重要な進展を遂げました。
C1 verb /ˈheɪsən/

hasten

急ぐ
Meaning
To move or act quickly; to cause something to happen sooner.
Example
He hastened to finish his work before the deadline.
彼は締め切り前に仕事を終わらせるために急いだ。
C2 noun /ˈhænd ˌrɪŋɪŋ/

hand-wringing

過剰な心配
Meaning
excessive worry or concern expressed in a visible or dramatic way.
Example
There was much hand-wringing over the political crisis.
政治危機について多くの心配がありました。
C2 verb /həˈbɪtʃuˌeɪt/

habituate

習慣づける
Meaning
to make someone accustomed to something
Example
The monks habituated themselves to meditation.
僧侶たちは瞑想に慣れました。
C2 noun /hʊˈzɑːr/

hussar

フサール
Meaning
a member of a light cavalry regiment in European armies, especially the Hungarian cavalry
Example
The hussar rode swiftly across the battlefield.
フサールは戦場を素早く駆け抜けた。
C1 adjective /ˈhɪd.i.əs/

Hideous

ひどい; 醜い; 恐ろしい
Meaning
extremely ugly or unpleasant; causing shock or disgust
Example
The monster in the movie had a hideous appearance.
映画のモンスターはひどい外見をしていました。
C2 noun /ˈhen.ə/

Henna

ヘンナ
Meaning
a reddish-brown dye made from the powdered leaves of a tropical shrub, used to color hair and decorate skin
Example
The bride's hands were beautifully decorated with intricate henna patterns for her wedding ceremony.
花嫁の手は、彼女の結婚式のために精巧なヘンナの模様で美しく飾られていました。
C2 noun /ˌhjuː.mɪ.fɪˈkeɪ.ʃən/

humification

腐植化
Meaning
The process of organic matter decomposition to form humus in soil.
Example
Humification enhances soil structure and fertility.
腐植化は土壌の構造と肥沃度を向上させます。
C2 noun /ˈhɛfər/

heifer

雌牛
Meaning
a young cow that has not borne a calf
Example
The farmer raised a heifer for dairy production.
農家は乳製品の生産のためにヘイファーを育てました。
C2 noun /hæˈʃiːʃ/

hashish

ハシシ
Meaning
a drug made from the resin of the cannabis plant
Example
The police arrested him for possessing hashish.
警察は彼をハシシを所持していたため逮捕した。
C2 adjective /ˌhæfˈhɑːr.tɪd/

halfhearted

やる気がない
Meaning
lacking enthusiasm or determination; unenthusiastic
Example
His halfhearted attempt to study did not bring good results.
彼のやる気がない勉強の試みは良い結果を生まなかった。
B2 noun /ˌhɑː.spɪˈtæl.ə.ti/

Hospitality

ホスピタリティ
Meaning
the friendly and generous reception and entertainment of guests or strangers
Example
The hotel staff's exceptional hospitality made our vacation truly memorable and enjoyable.
ホテルスタッフの素晴らしいホスピタリティが私たちの休暇を本当に思い出深く、楽しいものにしました。
C2 adjective /ˈhʌski/

husky

Meaning
deep, rough, and slightly hoarse voice; also refers to a strong and sturdy build
Example
He spoke in a husky voice after shouting all day.
C2 noun /ˈhʌvəl/

hovel

Meaning
a small, poorly built, and dirty house
Example
The refugees lived in a makeshift hovel.
C2 adjective /hɛkˈsæŋɡjələr/

hexangular

六角形の
Meaning
Having six angles or corners.
Example
The artist designed a hexangular frame for the mirror.
アーティストは鏡のために六角形のフレームをデザインしました。
C1 noun /haɪˈpɒtənjuːs/

hypotenuse

斜辺
Meaning
the longest side of a right-angled triangle, opposite the right angle.
Example
In a right triangle, the hypotenuse is always longer than the other two sides.
直角三角形では、斜辺は常に他の二辺より長いです。
B1 verb/noun /haɪk/

hike

Meaning
To take a long walk in the countryside or mountains; also to increase suddenly (prices, rates, etc.).
Example
We decided to hike in the hills this weekend.
A1 adjective /hɒt/

Hot

熱い; 温かい; 焼けるような;
Meaning
having high temperature; warm; heated;
Example
The coffee is too hot to drink.
コーヒーは飲むには熱すぎる。
A2 adverb /ˈhɑːd.li/

Hardly

ほとんどない; ほぼない; ほとんど信じられない
Meaning
scarcely; barely; almost not at all
Example
I could hardly believe what I was seeing.
私は見たものをほとんど信じることができませんでした。
B1 noun/verb /ˈhʌntɪŋ/

hunting

狩猟
Meaning
the activity of chasing and killing wild animals
Example
Hunting is strictly regulated in many countries.
狩猟は多くの国で厳格に規制されています。
C2 adjective /ˈhaɪˌbraʊ/

highbrow

知的に優れた
Meaning
intellectually superior or cultured; often describing art, literature, or activities appealing to intellectual tastes
Example
The museum is known for its highbrow exhibitions.
その博物館は知的な展示で知られています。
A2 verb /hɜːrt/

hurt

傷つける
Meaning
to cause pain or injury; to feel pain physically or emotionally
Example
My back hurts from sitting too long.
長時間座っていたので、背中が痛いです。
C2 adjective /ˈhæm ˌhændɪd/

ham-handed

不器用
Meaning
clumsy or inept in handling things or situations
Example
His ham-handed attempt to fix the computer made it worse.
彼の手際の悪い試みでコンピュータがさらに悪化しました。
C1 verb /hɜːrl/

hurl

Meaning
To throw something with great force.
Example
The boy hurled a stone into the river.
C1 noun /ˈhɛrəsi/

heresy

異端
Meaning
belief or opinion that goes against established religious doctrine or accepted beliefs.
Example
In medieval times, heresy was often punished severely.
中世では、異端はしばしば厳しく罰せられました。
C1 noun /ˈhɛzɪtəns/

hesitance

ためらい
Meaning
The quality or state of being reluctant or uncertain.
Example
Her hesitance to speak up delayed the decision.
彼女のためらいは決定を遅らせました。
B2 verb /hɔːnt/

haunt

悩ませる
Meaning
to trouble persistently; to visit as a ghost
Example
The old memories still haunt me.
古い記憶は今でも私を悩ませている。
B1 adjective /ˈhoʊpfəl/

Hopeful

希望に満ちた
Meaning
feeling or inspiring optimism about a future event; confident; optimistic
Example
He remained hopeful despite the challenges.
彼は挑戦にもかかわらず希望を持ち続けました。
C2 noun /hɪˈdʒɛməni/ or /ˈhɛdʒəmoʊni/

hegemony

覇権
Meaning
leadership or dominance, especially by one state or group over others
Example
The empire maintained its hegemony over neighboring states.
帝国は隣国に対してその覇権を維持した。
A1 noun /hæt/

Hat

帽子
Meaning
a covering for the head, typically with a brim and worn outdoors
Example
He always wears a hat when working in the garden.
彼は庭で働いているとき、いつも帽子をかぶっています。
C1 noun /ˈhɑː.mɪ.saɪd/

Homicide

殺人
Meaning
the deliberate and unlawful killing of one person by another; murder
Example
The detective was assigned to investigate the homicide that occurred downtown last night.
探偵は昨晩市内で発生した殺人事件の調査を担当しました。
B2 adjective ˈhæzədəs

hazardous

危険な
Meaning
Dangerous, risky, or potentially harmful
Example
Hazardous pollutants increase health risks.
危険な汚染物質は健康リスクを増加させます。
B2 verb /ˈhezɪteɪt/

hesitate

ためらう
Meaning
to pause before acting; to be uncertain about what to do
Example
Don't hesitate to ask for help.
助けを求めることを躊躇しないでください。
B2 adjective /ˈheɪsti/

Hasty

急いだ; 慌ただしい
Meaning
done or acting with excessive speed or urgency; hurried
Example
Don't make hasty decisions when you're angry.
怒っているときに急いだ決定をしないでください。
A1 adverb /haʊ/

how

どう
Meaning
in what way or manner; by what means
Example
How do you solve this problem?
この問題をどう解決しますか？
A2 adjective /ˈɑːnɪst/

honest

正直
Meaning
free of deceit and untruthfulness; sincere
Example
She is known as an honest and trustworthy person.
彼女は誠実で信頼できる人物として知られています。
C1 noun /ˈhɔːr.nət/

Hornet

スズメバチ
Meaning
a large wasp that can sting and is often aggressive
Example
The hornet built its nest under the roof.
スズメバチは屋根の下に巣を作った。
B1 noun /ˈhɛlθˌkɛər/

healthcare

医療ケア
Meaning
the organized provision of medical care to people
Example
The country invested heavily in healthcare to improve public health.
その国は公共の健康を改善するために医療ケアに大きな投資をしました。
C2 noun /ˈhaɪərəˌɡlɪf/

hieroglyph

ヒエログリフ
Meaning
A picture or symbol used in ancient writing systems, especially Egyptian writing.
Example
The walls of the temple were covered in hieroglyphs.
寺院の壁はヒエログリフで覆われていた。
A2 noun /ˈheəkʌt/

haircut

散髪
Meaning
the act or style of cutting hair
Example
I got a haircut before the wedding.
私は結婚式の前に散髪しました。
C1 noun /ˈhiːdəˌnɪzəm/

hedonism

快楽主義
Meaning
The pursuit of pleasure and self-indulgence as the highest goal.
Example
The lifestyle of the rich is often criticized as pure hedonism.
金持ちのライフスタイルはしばしば純粋な快楽主義として批判されます。
B1 noun /ˈhɛdˌlaɪn/

headline

見出し
Meaning
The title of a newspaper article printed in large letters.
Example
The scandal made front-page headlines.
そのスキャンダルはフロントページの見出しになった。
C2 noun /hɜːrs/

Hearse

霊柩車;
Meaning
a vehicle for conveying the coffin at a funeral; a funeral car
Example
The black hearse slowly made its way to the cemetery, followed by a procession of mourners.
黒い霊柩車がゆっくりと墓地に向かい、その後ろに哀悼の列が続いていた。
C2 noun /ˈhɔːtɪnəs/

haughtiness

傲慢
Meaning
The appearance or quality of being arrogantly superior and disdainful.
Example
His haughtiness made him unpopular among his peers.
彼の傲慢さは彼を同僚の中で不人気にしました。
A1 noun /hoʊm/

home

家
Meaning
the place where one lives, especially with family; a residence
Example
She finally returned home after a long journey.
彼女は長い旅の後、やっと家に帰りました。
B1 verb /hiːl/

heal

癒す
Meaning
to cure; to become healthy again
Example
Time will heal all wounds.
時間がすべての傷を癒す。
A1 noun /ˈaʊər/

hour

Meaning
A period of time equal to 60 minutes.
Example
The meeting lasted for two hours.
A1 verb /ˈhæpən/

happen

起こる
Meaning
to occur or take place; to come about by chance
Example
What happened at the meeting yesterday?
昨日の会議で何が起こったのですか？
C2 noun /ˌhɛtərəʤəˈniːɪti/

heterogeneity

異質性
Meaning
the quality or state of being diverse in character or content
Example
The cultural heterogeneity of the city makes it vibrant and unique.
その都市の文化的異質性は、それを活気に満ちたユニークなものにしています。
B2 verb /hætʃ/

hatch

孵化する
Meaning
to emerge from an egg; to devise or create a plan
Example
The bird will hatch from its egg soon.
鳥はすぐに卵から孵化します。
A1 verb /hoʊp/

hope

希望する
Meaning
to expect and desire that something will happen
Example
I hope it doesn't rain tomorrow.
明日雨が降らないことを願っています。
C2 verb /həˈræŋ/

harangue

長く情熱的な演説をする
Meaning
to deliver a long, passionate, and often angry speech
Example
The politician harangued the crowd for over an hour.
政治家は群衆に一時間以上も演説をしました。
B2 noun /ˈhæz.ərd/

Hazard

危険; リスク
Meaning
a danger or risk; something that poses a threat to safety
Example
Smoking is a serious health hazard that can lead to lung cancer and heart disease.
喫煙は深刻な健康リスクであり、肺癌や心臓病を引き起こす可能性があります。
C2 adjective /hɪk/

Hick

田舎者; 田舎の人
Meaning
unsophisticated person from a rural area; country bumpkin
Example
He had a hick accent from growing up in a small town.
彼は小さな町で育ったため、田舎者のアクセントがあった。
C1 noun /hjuː/

hue

色合い
Meaning
A color or shade.
Example
The artist chose a soft blue hue for the background.
アーティストは背景のために柔らかい青い色合いを選びました。
C1 adjective /ˈheɪt.fəl/

Hateful

憎しみの
Meaning
causing or deserving hatred; extremely unpleasant or offensive
Example
His hateful comments hurt everyone's feelings.
彼の憎しみを込めたコメントは皆の感情を傷つけました。
B2 noun ˈhɑːrvɪstɪŋ

harvesting

収穫
Meaning
The process of gathering a ripe crop from the fields or collecting natural resources.
Example
Unregulated harvesting affects the biodiversity of oceans.
規制されていない収穫は海洋の生物多様性に影響を与えます。
C2 adjective /ˈhaɪd.baʊnd/

hidebound

Meaning
unwilling or unable to change because of tradition or convention
Example
He is too hidebound to accept new ideas.
C1 adjective /ˈhæɡ.ərd/

Haggard

疲れ果てて病気のように見える、特に疲労、心配、または苦しみから
Meaning
looking exhausted and unwell, especially from fatigue, worry, or suffering
Example
After working three nights without sleep, he looked haggard.
三晩寝ずに働いた後、彼は疲れ果てて見えた。
B2 noun /ˌhez.ɪˈteɪ.ʃən/

Hesitation

ためらい; 躊躇
Meaning
the action of pausing or delaying; uncertainty or unwillingness to act
Example
After a moment of hesitation, she decided to accept the challenging job offer from the company.
一瞬のためらいの後、彼女は会社からの挑戦的な仕事のオファーを受け入れることに決めました。
B2 adjective /ˈhɜː.bəl/

herbal

ハーバル
Meaning
Made from or containing herbs, especially for medicinal purposes.
Example
Herbal remedies were widely used here.
ここではハーバル療法が広く使われていました。
C1 noun /ˈhɔː.kər/

Hawker

屋台販売者
Meaning
a person who travels about selling goods, typically from door to door or on the street
Example
The hawker sold fresh fruits from his cart.
屋台販売者は彼のカートから新鮮な果物を売っていた。
C2 noun /hɔːɡ plʌm/

Hog plum

ホッグプラム
Meaning
tropical fruit with yellow skin and sour taste
Example
Hog plums are often used to make pickles and chutneys.
ホッグプラムはよくピクルスやチャツネを作るために使われます。
C2 noun /ˌhæŋ.ər ˈɒn/

hanger-on

おこぼれ
Meaning
a person who spends time with a powerful or famous person to gain benefits.
Example
The celebrity was always surrounded by hangers-on.
その有名人はいつもおこぼれの人々に囲まれていた。
B1 adverb /ˈhaɪli/

highly

非常に
Meaning
to a great degree; very
Example
She is highly respected in her field.
彼女は自分の分野で非常に尊敬されています。
C1 noun /ˈhɜːrbɪsaɪd/

herbicide

除草剤
Meaning
A chemical substance used to kill unwanted plants, especially weeds.
Example
Farmers used herbicide to protect their crops from invasive weeds.
農家は侵入する雑草から作物を守るために除草剤を使用しました。
C2 verb /ˈhɑːrpɪŋ/

harping

繰り返し不満を言う
Meaning
continuously talking or complaining about something in a tiresome way
Example
She kept harping on about the mistakes I made.
彼女は私が犯した間違いについて繰り返し不満を言っていました。
C2 noun /haɪˈdrɒl.ɪ.sɪs/

hydrolysis

加水分解
Meaning
A chemical process that breaks down compounds by adding water, splitting complex molecules into simpler forms.
Example
Hydrolysis breaks down complex molecules into simpler forms.
加水分解は複雑な分子をより単純な形に分解します。
C2 noun /ˈhæbɪtənt/

habitant

住民
Meaning
An inhabitant; a person or animal that lives in a particular place.
Example
The habitants of the village were friendly and welcoming.
村の住民は親切で歓迎してくれました。
B2 adjective /hɪˈstɛrɪkəl/

hysterical

非常に面白い、または感情的に制御不能
Meaning
Extremely funny or uncontrollably emotional.
Example
The comedian's jokes were absolutely hysterical.
そのコメディアンのジョークはまさに爆笑ものだった。
B2 noun /ˈhʌrɪkən/

hurricane

ハリケーン
Meaning
A violent tropical storm with very strong winds and heavy rain.
Example
The hurricane destroyed hundreds of homes along the coast.
ハリケーンは沿岸の数百軒の家を破壊しました。
A2 noun /ˈhæb.ɪt/

habit

習慣
Meaning
A settled or regular tendency or practice, especially one that is hard to give up.
Example
Eye rubbing is a harmful habit.
目をこすることは有害な習慣です。
B2 noun /hɔːk/

Hawk

鷹
Meaning
a bird of prey with broad wings and strong talons used for hunting
Example
The hawk soared high above the field hunting for prey.
鷹は獲物を探して畑の上を高く飛んだ。
C2 verb /həˈmɑː.dʒə.naɪz/

homogenize

均質化
Meaning
To make uniform or similar by blending or mixing different elements.
Example
The company tried to homogenize its products across global markets.
その会社は世界市場で製品を均質化しようとしました。
C1 verb /hjuːˈmɪlieɪt/

humiliate

侮辱する
Meaning
to make someone feel ashamed or foolish by injuring their dignity
Example
He was humiliated by his public failure.
彼は公の失敗で侮辱された。
B1 verb /hʊk/

hook

フック
Meaning
to catch with a hook; to fasten
Example
He hooked the fish successfully.
彼は成功裏に魚を釣り上げた。
B2 adjective haɪˈdʒiː.nɪk

hygienic

Meaning
Conducive to maintaining health and preventing disease, especially by being clean.
Example
Maintaining hygienic conditions in hospitals is crucial.
B2 noun /heɪ/

hay

干し草
Meaning
grass that has been cut, dried, and stored for use as animal feed
Example
The cows were eating hay in the barn.
牛たちは納屋で干し草を食べていました。
B2 adjective /ˈhjuː.mər.əs/

Humorous

ユーモアのある; 面白い; 笑いを引き起こす;
Meaning
funny; amusing; causing laughter;
Example
His humorous stories always make everyone laugh.
彼のユーモラスな話はいつも皆を笑わせる。
C2 noun /ˈhɒthɛd/

hothead

短気な人
Meaning
a person who acts quickly and without thinking when angry
Example
He is such a hothead that he often starts arguments.
彼は短気な人で、よく議論を始める。
B1 noun /ˈhaʊshoʊld/

household

家庭
Meaning
All the people living together in one house, considered as a unit.
Example
There are five people in our household.
私たちの家庭には五人います。
C1 verb /ˈhæɡəl/

haggle

値切る
Meaning
to argue about the price; to bargain persistently
Example
They haggled over the price for an hour.
彼らは価格のことで1時間も値引き交渉をした。
C1 adjective /ˌhɛtərəˈʤiːniəs/

heterogeneous

異種の
Meaning
consisting of different kinds or diverse elements
Example
The classroom was filled with a heterogeneous group of students.
教室は異種の学生のグループでいっぱいだった。
A1 pronoun /hiː/

he

彼 (男性)
Meaning
used to refer to a male person or animal already mentioned or easily identified
Example
He is my best friend.
彼は私の親友です。
C1 noun ˈhʌz.bən.dri

husbandry

農業と畜産業
Meaning
The care, cultivation, and breeding of crops and animals; farming and agriculture.
Example
Proper husbandry techniques improve livestock health.
適切な農業技術が家畜の健康を向上させます。
A1 interjection /həˈloʊ/

hello

ハロー
Meaning
a greeting or expression used when meeting someone or starting a conversation
Example
She answered the phone with a cheerful hello.
彼女は電話を取って、元気にハローと言った。
C1 adjective ˌhaɪ.pəˈθet.ɪ.kəl

hypothetical

仮定的, 想定的, 理論的
Meaning
Based on or serving as a hypothesis; supposed but not necessarily real or true.
Example
The discussion was based on hypothetical scenarios.
議論は仮定的なシナリオに基づいていました。
A1 verb /hoʊld/

hold

持つ
Meaning
to grasp or carry something; to maintain a position
Example
Please hold my hand.
私の手を取ってください。
B2 noun /ˈhɑːrvɪst/

harvest

収穫
Meaning
the process or period of gathering crops
Example
Farmers are busy during the rice harvest season.
農家は米の収穫の季節に忙しい。
C2 adjective /ˈhɔːri/

hoary

灰色の, 古い
Meaning
gray or white with age; very old and respected
Example
The hoary oak tree stood as a witness to centuries of history.
古いオークの木は何世代にもわたる歴史の証人として立っていた。
A1 verb /hɪər/

hear

聞く
Meaning
to perceive sound; to listen to
Example
I can hear the birds singing.
私は鳥が歌っているのを聞くことができます。
B2 noun /ˈhɑːrd.ʃɪp/

Hardship

困難、苦難
Meaning
severe suffering or privation; difficulty or distress
Example
Despite facing many hardships during the war, the family remained united and hopeful.
戦争中に多くの困難に直面したにもかかわらず、家族は団結して希望に満ちていました。
C1 verb ˈhɪndər

hinder

妨げる
Meaning
To obstruct or delay the progress of something
Example
Excessive rain hinders vegetable growth.
過剰な雨は野菜の成長を妨げます。
A1 pronoun /hɜːrz/

hers

彼女の（女性の）物
Meaning
used to refer to something that belongs to or is associated with a female person previously mentioned or easily identified.
Example
That blue bag is hers.
その青いバッグは彼女のものです。
C1 adjective /ˈhɑːrdi/

hardy

頑丈, 強健
Meaning
Strong, robust, and capable of enduring difficult conditions.
Example
Hardy plants can survive the harsh winter.
頑丈な植物は厳しい冬を生き抜くことができます。
C2 noun /ˈhɔːzər/

hawser

船を繋ぐための太いロープ
Meaning
A thick rope or cable used in mooring or towing a ship.
Example
The sailors secured the ship to the dock with a heavy hawser.
船員たちは重いハウザーを使って船をドックに固定しました。
A2 noun /haɪt/

height

高さ
Meaning
the measurement of someone or something from base to top
Example
The height of the tower impressed the visitors.
塔の高さは訪問者を感動させました。
C2 noun /ˌhɜːrpəˈtɒlədʒɪst/

herpetologist

爬虫類学者
Meaning
A scientist who studies reptiles and amphibians.
Example
The herpetologist discovered a new species of frog in the rainforest.
その爬虫類学者は熱帯雨林で新しいカエルの種を発見した。
B1 adverb /ˌhæfˈweɪ/

halfway

途中で
Meaning
at or to a point equal in distance between two points
Example
We met halfway between the two towns.
私たちは二つの町の間の途中で会いました。
B2 adjective /ˌhaɪ ˈtɛk/

high-tech

ハイテク
Meaning
using or involving advanced technology.
Example
The company produces high-tech medical devices.
その会社はハイテク医療機器を生産しています。
B2 adverb /hɛns/

hence

それゆえ
Meaning
for this reason; as a result
Example
She was the best candidate, hence she was chosen for the job.
彼女は最良の候補者であったため、仕事のために選ばれました。
C2 verb (past tense, past participle), adjective /ˈhæmstrʌŋ/

hamstrung

無力または制限された
Meaning
crippled or severely restricted in movement or progress.
Example
The team was hamstrung by lack of resources.
チームはリソース不足で制約を受けていた。
B2 adjective /hɪˈspænɪk/

hispanic

ヒスパニック / スペイン語を話す
Meaning
relating to Spain or Spanish-speaking countries, especially Latin America.
Example
She studies Hispanic culture and language.
彼女はヒスパニック文化と言語を学んでいます。
C2 noun /ˈhɔːrs.liːt͡ʃ/

Horse-leach

馬のヒル
Meaning
a large species of leech that was traditionally used in veterinary medicine
Example
The veterinarian explained that horse-leach was once commonly used to treat horses.
獣医は、馬のヒルがかつて馬の治療に広く使われていたと説明しました。
B1 adjective /ˈhɪd.ən/

Hidden

隠れた; 秘密の; 見えない
Meaning
concealed from view; kept secret; not visible or apparent
Example
There was a hidden camera in the room.
部屋には隠れたカメラがありました。
C2 adjective /ˌhaɪpərˈbɔːriən/

hyperborean

極北の
Meaning
Relating to the extreme north; very cold or frigid.
Example
The explorers prepared for the hyperborean climate of the Arctic.
探検家たちは北極の極北の気候に備えていた。
C2 noun /ˈhelmz.mən/

Helmsman

舵手; キャプテン
Meaning
a person who steers a ship or boat; the person at the helm of a vessel
Example
The experienced helmsman skillfully guided the yacht through the narrow channel during the storm.
経験豊富な舵手は、嵐の中で狭い水路をヨットで巧みに導きました。
C2 adjective /ˌhɑːrdˈbɪtn̩/

hard-bitten

頑固で経験豊富
Meaning
tough and experienced, not easily affected by emotions or hardship
Example
The hard-bitten detective showed no sign of surprise at the crime scene.
その経験豊富な探偵は犯罪現場で驚きの兆候を見せませんでした。
C1 verb /ˈhjuːmənaɪz/

humanize

人間化する
Meaning
To make something more humane, kind, or relatable.
Example
The teacher tried to humanize the lesson with personal stories.
教師は個人的な物語を使ってレッスンを人間化しようとしました。
C1 adjective /ˌhaɪdroʊɪˈlɛktrɪk/

hydroelectric

水力発電
Meaning
Relating to or denoting the generation of electricity using flowing water.
Example
The country invested heavily in hydroelectric power plants.
その国は水力発電所に多額の投資をしました。
A2 adverb /ˈhæpɪli/

happily

幸せに
Meaning
in a happy manner; with pleasure or satisfaction
Example
The children played happily in the garden.
子供たちは庭で幸せに遊びました。
B2 noun /hiːl/

Heel

かかと
Meaning
the back part of the human foot below the ankle
Example
She wore shoes with high heels to the party.
彼女はパーティーに高いヒールの靴を履いていた。
B2 verb /ˈhɑːrnɪs/

harness

Meaning
To control and make use of natural resources, especially energy.
Example
Scientists are working to harness solar power effectively.
C1 adjective /ˈhæb.ɪ.tə.bəl/

Habitable

居住可能
Meaning
suitable or good enough to live in
Example
The planet Mars may become habitable in the future.
火星は将来、居住可能になるかもしれません。
C2 adjective /hɜːrˈbeɪʃəs/

herbaceous

草本
Meaning
Relating to or resembling herbs; plants with soft, non-woody stems.
Example
The garden was filled with herbaceous plants that thrived in the summer.
庭園には夏に繁茂する草本植物で満たされていた。
C1 noun /ˈhɒməˌfoʊn/

homophone

同音異義語
Meaning
A word that is pronounced the same as another word but differs in meaning, and often spelling.
Example
The words 'pair' and 'pear' are homophones.
「pair」と「pear」の単語は同音異義語です。
A1 adjective /hɑːrd/

hard

硬い
Meaning
solid, firm, or difficult to do or endure
Example
The exam was very hard for most students.
試験はほとんどの学生にとって非常に難しかった。
C2 adjective /ˈhed.i/

Heady

陶酔的
Meaning
having a strong or exhilarating effect; intoxicating; exciting
Example
The heady perfume of jasmine filled the garden.
ジャスミンの陶酔的な香りが庭に満ちていた。
B2 noun /ˈhaɪdrədʒən/

hydrogen

水素
Meaning
a colorless, odorless, highly flammable gas that is the lightest and most abundant chemical element in the universe
Example
Hydrogen is used as a clean fuel in many energy systems.
水素は多くのエネルギーシステムでクリーンな燃料として使用されています。
C2 noun /ˈhaɪdrə/

hydra

ヒドラ
Meaning
a many-headed serpent in Greek mythology; a problem that seems to grow worse when attempts are made to solve it
Example
Corruption is like a hydra, hard to defeat completely.
汚職はヒドラのようで、完全に打ち負かすのは難しい。