spherometer
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C2 noun /sfɪˈrɒmɪtər/

spherometer

Meaning
An instrument used for measuring the curvature of spherical surfaces.
Example
The scientist used a spherometer to measure the lens curvature.
C2 verb /ˌmɪskənˈsiːv/

misconceive

Meaning
To misunderstand or form an incorrect idea about something.
Example
He misconceived the purpose of the project.
C2 adjective /ˈmɔːdlɪn/

maudlin

Meaning
Overly sentimental, often tearfully or weakly emotional.
Example
He became maudlin after a few drinks.
C2 noun /ˈætəmaɪzər/

atomizer

Meaning
A device that sprays liquid into a fine mist.
Example
She used an atomizer to apply the perfume evenly.
C2 adjective /ˈsteɪ.dʒi/

stagy

Meaning
Overly theatrical, artificial, or exaggerated in manner or style.
Example
Her performance felt stagy and unnatural.
C2 noun /ˈdjʊərəns/

durance

Meaning
imprisonment or confinement
Example
The prisoner spent years in durance before his release.
C2 noun /ˈrɛkjʊzənt/

recusant

Meaning
a person who refuses to submit to authority or comply with rules
Example
The recusant opposed the new law.
C2 adjective /ɪmˈplækəbl/

implacable

Meaning
unable to be appeased, calmed, or pacified
Example
The soldiers faced an implacable enemy who refused to surrender.
C2 noun /ˈzuːəʊˌplæŋktən/

zooplankton

Meaning
Microscopic aquatic animals that drift in water bodies and form an essential part of the aquatic food chain, serving as food for fish and other marine organisms.
Example
Zooplankton plays an important role in the aquatic food chain.
C2 noun /flɔːˈrɛsəns/

florescence

Meaning
The process, state, or period of flowering.
Example
The garden reached its peak florescence in spring.
C2 adjective /ˈsæpɪd/

sapid

Meaning
Having a pleasant taste; flavorful.
Example
The chef prepared a sapid dish that delighted everyone at the table.
C2 adjective /ˈrɛkənˌdaɪt/ or /ˈrɛkəndaɪt/

recondite

Meaning
Little known or difficult to understand.
Example
The professor’s lecture was full of recondite theories.
C2 verb /ɪkˈspɒstjʊleɪt/

expostulate

Meaning
to express strong disapproval or disagreement
Example
She expostulated with her friend about the risky decision.
C2 adjective /bjuːˈkɒlɪk/

bucolic

Meaning
Relating to the pleasant aspects of the countryside and country life.
Example
They enjoyed a bucolic picnic by the river.
C2 verb /prɪˈpɒndəreɪt/

preponderate

Meaning
To be greater in influence, weight, or number.
Example
In the debate, logical arguments preponderated over emotional appeals.
C2 noun /ˈsɪlədʒɪzəm/

syllogism

Meaning
A form of reasoning in which a conclusion is drawn from two given or assumed premises.
Example
The philosopher explained the concept of syllogism using simple examples.
C2 adjective /vəˈnɪəriəl/

venereal

Meaning
relating to sexual intercourse or sexually transmitted diseases
Example
Doctors warn about the dangers of venereal diseases.
C2 adjective /ˌɪndɪˈvɜːrtɪbəl/

indivertible

Meaning
Not able to be turned aside or diverted.
Example
The judge's indivertible attention was on the case.
C2 adjective /ˈdjuːtiəbl/

dutiable

Meaning
subject to customs duty or tax
Example
Imported electronics are often dutiable at the border.
C2 noun /ˌrɛprɪˈhɛnʃən/

reprehension

Meaning
The act of rebuking or criticizing severely.
Example
The teacher’s reprehension of the student’s behavior was justified.
C2 noun /ˈfɪlɪɡri/

filigree

Meaning
delicate ornamental work of fine wire, usually of gold or silver
Example
The necklace was decorated with intricate gold filigree.
C2 noun /ˌɡrɛnəˈdɪə/

grenadier

Meaning
A soldier who specialized in throwing grenades; later used to describe an elite infantryman.
Example
The grenadier stood proudly at the front of the regiment.
C2 verb /ˌdɒmɪˈnɪə/

domineer

Meaning
to assert one's will over another in an arrogant way
Example
He tends to domineer over his younger colleagues.
C2 verb /ˈɑːskjʊleɪt/

osculate

Meaning
To kiss.
Example
They osculated under the mistletoe during the party.
C2 adjective /ˈlɪtərəl/

littoral

Meaning
Related to or situated on the shore of the sea or a lake.
Example
The littoral zone is home to many unique marine species.
C2 noun /pərˈsɪpiəns/

percipience

Meaning
The ability to perceive, understand, or notice things quickly.
Example
His percipience in reading people made him a great negotiator.
C2 noun /ˌself əˈbeɪs.mənt/

self-abasement

Meaning
The act of belittling or humiliating oneself.
Example
His constant self-abasement made others uncomfortable.
C2 adjective /ˈtjuːtɪləri/

tutelary

Meaning
Relating to or serving as a guardian or protector, often used for deities or spirits.
Example
Athena was considered the tutelary goddess of Athens.
C2 adjective /ˈprəʊ.lɪks/

prolix

Meaning
using too many words; tediously lengthy
Example
The professor’s prolix lecture put many students to sleep.
C2 noun /bʊr/

Boor

Meaning
a rough and bad-mannered person; someone who lacks refinement or culture
Example
The wealthy businessman was actually a boor who showed no respect for others.
C2 adjective /rɪˈmjuːnərətɪv/

remunerative

Meaning
Financially rewarding or profitable.
Example
He chose a remunerative career in medicine.
C2 noun /lɪˈvaɪəθən/

leviathan

Meaning
a huge sea monster or something very large and powerful.
Example
The ship looked like a leviathan on the horizon.
C2 verb /ˈhɑːbəl/

hobble

Meaning
to walk awkwardly with difficulty, usually due to injury
Example
He hobbled across the room after twisting his ankle.
C2 adjective ˌmɔː.fəˈlɒdʒ.ɪ.kəl

morphological

Meaning
Related to the structure and formation of words; concerning morphology in linguistics.
Example
Morphological analysis helps AI understand word structures.
C2 verb /bɪˈwɪtʃ/

bewitch

Meaning
to enchant or fascinate someone as if by magic
Example
The dancer's performance bewitched the audience.
C2 verb /dɪˈbɔːtʃ/

debauch

Meaning
to corrupt morally; to lead into excessive indulgence in sensual pleasures
Example
The novel shows how wealth can debauch a person's character.
C2 noun /ˌɪnkænˈteɪʃən/

incantation

Meaning
a series of words used as a magic spell or charm
Example
The wizard chanted an incantation to summon the spirits.
C2 noun /ˈsʌfərəns/

sufferance

Meaning
patient endurance of pain, hardship, or delay; passive consent or tolerance
Example
He lived in poverty with quiet sufferance.
C2 adjective /ɪnˈvɪdiəs/

invidious

Meaning
likely to arouse resentment, envy, or anger in others
Example
The manager's invidious remarks created tension among the employees.
C2 noun /ˈplɛdʒiː/

pledgee

Meaning
a person to whom something is pledged or given as security
Example
The bank is the pledgee of the collateral until the loan is repaid.
C2 adjective /ˈvɜːrnəl/

vernal

Meaning
related to spring; fresh, youthful
Example
The garden was filled with vernal beauty after the long winter.
C2 noun /ˈtaɪroʊ/

tyro

Meaning
A beginner or novice in a field or activity.
Example
As a tyro in programming, she needed constant guidance.
C2 noun /ˈdaɪəˌdɛm/

diadem

Meaning
A crown or headband worn as a symbol of royalty or authority.
Example
The queen wore a glittering diadem at the coronation.
C2 noun /ˈjuːzjuːfrʌkt/

usufruct

Meaning
The legal right to use and enjoy the benefits of someone else’s property without owning it.
Example
The tenant had the usufruct of the land but not its ownership.
C2 verb /ˈprætəl/

prattle

Meaning
to talk at length in a foolish or inconsequential way
Example
The children would prattle on about their games.
C2 noun /bɪˈnɪɡnɪti/

Benignity

Meaning
kindness; gentleness; the quality of being benign or gracious
Example
Her benignity towards all people made her beloved by everyone.
C2 adjective /ˈmɪnsɪŋ/

mincing

Meaning
affectedly delicate, dainty, or refined in manner or movement
Example
He walked with mincing steps across the stage.
C2 noun /ˌɛksɪˈkreɪʃən/

execration

Meaning
An act of cursing or denouncing someone or something with hatred.
Example
The dictator’s name was spoken with execration after his fall.
C2 verb /ˈɪndjʊˌreɪt/

indurate

Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
C2 noun, verb /əˈfrʌnt/

affront

Meaning
An action or remark that causes outrage or offense.
Example
He took her criticism as a personal affront.
C2 verb /æbˈdʒʊər/

abjure

Meaning
to formally renounce or give up a belief, cause, or claim
Example
He abjured his allegiance to the old regime.
C2 noun /buːb/

boob

Meaning
a foolish or clumsy person; an informal and sometimes rude term for a woman's breast
Example
He felt like a complete boob after forgetting the meeting.
C2 noun /ˈɒb.stɪ.nə.si/

obstinacy

Meaning
Stubborn refusal to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Example
His obstinacy made negotiations difficult.
C2 noun /ˌmɑːrtəˈnɛt/

martinet

Meaning
A strict disciplinarian who demands rigid adherence to rules.
Example
The new manager was such a martinet that even minor infractions were punished.
C2 verb /aɪˈtɪnəˌreɪt/

itinerate

Meaning
To travel from place to place, usually for the purpose of work or preaching.
Example
The missionary itinerated throughout the region to spread the message.
C2 noun /ˈæl.ɪ.mənt/

aliment

Meaning
food or nourishment that sustains life
Example
Fruits and vegetables are important aliments for a healthy body.
C2 noun /ˈnoʊzˌɡeɪ/

nosegay

Meaning
a small bunch of flowers, typically given as a gift or carried for decoration
Example
She carried a nosegay of fresh roses to the ceremony.
C2 adjective /spæzˈmɒdɪk/

spasmodic

Meaning
occurring irregularly or in sudden bursts
Example
The patient experienced spasmodic coughing during the night.
C2 noun /ˌnjʊə.rəʊˈdʒɛn.ɪ.sɪs/

neurogenesis

Meaning
The process of forming new nerve cells in the brain.
Example
Scientists are studying neurogenesis to understand brain health.
C2 noun /meɪs/

Mase

Meaning
spice obtained from the reddish seed covering of the nutmeg seed
Example
A pinch of mace adds warmth to the dessert.
C2 adjective /ɪˈkwɪvəkəl/

equivocal

Meaning
Open to more than one interpretation; ambiguous.
Example
His equivocal answer confused everyone.
C2 noun /ˈdɒkɪt/

docket

Meaning
a list or schedule of cases to be tried in a court or items to be done
Example
The judge reviewed the docket before starting the session.
C2 noun /ˈænsɛstrɪs/

ancestress

Meaning
a female ancestor; a woman from whom one is descended
Example
She discovered that her ancestress came from a small village in Bengal.
C2 noun /ˈmær.oʊ ʌv ˈplæn.tɪn triː/

Marrow of plantain tree

Meaning
the soft inner part of the banana plant stem that is used as a vegetable in cooking
Example
The marrow of plantain tree is commonly used in traditional Bengali cuisine.
C2 adjective /ˈveɪpərəs/

Vaporous

Meaning
consisting of vapor; vague or insubstantial
Example
The morning air was filled with vaporous mist.
C2 noun /hɪˈlærɪti/

hilarity

Meaning
Extreme amusement, especially when expressed by laughter.
Example
The movie caused great hilarity among the audience.
C2 verb /ˈseɪʃiˌeɪt/

satiate

Meaning
To satisfy fully, especially with food or desire.
Example
The large meal satiated his hunger.
C2 verb /ˈoʊɡəl/

ogle

Meaning
To look at someone with obvious sexual interest.
Example
He kept ogling the models on the runway.
C2 verb /ˈdɛsɪkreɪt/

desecrate

Meaning
to treat a sacred place or object with disrespect or violation
Example
The vandals desecrated the ancient temple walls with graffiti.
C2 noun (compound/erroneous entry) /ɪnˈɛksərəbl ɑːrmi/

inexorableinexorablearmy

Meaning
This appears to be a corrupted or concatenated form; interpreted as 'inexorable army' — an unstoppable or relentless force.
Example
The rebels feared the inexorable army approaching their stronghold.
C2 verb /ˈtɪtər/

titter

Meaning
to laugh in a quiet, nervous, or restrained way
Example
The students began to titter when the projector froze.
C2 adjective /ˈmiː.di.eɪ.tɪv/

mediative

Meaning
Related to mediation, helping to resolve conflicts through diplomatic means.
Example
His mediative skills helped resolve the conflict.
C2 noun /ˈlæɡ.ərd/

Laggard

Meaning
a person who makes slow progress and falls behind others; someone who is slow to act
Example
The laggard student finally submitted his assignment after the deadline.
C2 verb /ˈtɛmpəˌraɪz/

temporize

Meaning
To delay making a decision or taking action in order to gain time.
Example
The politician temporized when asked about the controversial issue.
C2 noun /əˈnæb.ə.lɪ.zəm/

anabolism

Meaning
The set of metabolic pathways that construct molecules from smaller units, involving tissue repair and growth.
Example
Anabolism is essential for muscle growth and tissue repair.
C2 verb /ɪnˈhjuːm/

inhume

Meaning
to bury a dead body in the ground
Example
They inhumed the warrior with full honors.
C2 noun /ˈbrɪtɪˌsɪzəm/

briticism

Meaning
a word, phrase, or characteristic feature of British English
Example
The word 'lorry' is a well-known Briticism.
C2 verb /əˈbreɪd/

abrade

Meaning
to scrape or wear away the surface by friction or erosion
Example
The rough cloth can easily abrade the skin.
C2 noun /rɪˌkrɪmɪˈneɪʃən/

recrimination

Meaning
an accusation made in response to an accusation; mutual blaming
Example
The debate quickly descended into mutual recriminations.
C2 adjective /dʒoʊˈkoʊs/

jocose

Meaning
playful or humorous in speech or behavior
Example
The professor’s jocose remarks kept the class entertained.
C2 verb /ˈkɔː.tə.raɪz/

cauterize

Meaning
to burn tissue to stop bleeding or prevent infection
Example
The doctor cauterized the wound to stop the bleeding.
C2 noun /ˈhɑːdɪhʊd/

hardihood

Meaning
Courage, boldness, or daring behavior; also physical robustness.
Example
The mountaineer's hardihood impressed the entire team.
C2 adjective /ˌsʌpəzɪˈtɪʃəs/

supposititious

Meaning
Based on assumption rather than fact; not genuine or authentic.
Example
The story turned out to be supposititious, with no evidence to support it.
C2 noun /pɛnˈtæmɪtər/

pentameter

Meaning
A line of verse consisting of five metrical feet.
Example
Shakespeare often wrote his plays in iambic pentameter.
C2 adjective /bɪˈhoʊldən/

beholden

Meaning
indebted or obliged to someone for a service or help
Example
He felt beholden to his mentor for all the guidance.
C2 adjective ˈen.də.krɪn

endocrine

Meaning
Relating to or denoting glands that secrete hormones directly into the blood.
Example
The endocrine system regulates metabolism and growth.
C2 verb /kənˈvoʊk/

convoke

Meaning
to call together or summon a meeting or assembly
Example
The committee convoked an emergency session to discuss the crisis.
C2 noun /ɡæf/

gaff

Meaning
A social blunder or mistake; also a hook or device used in fishing or theater.
Example
He made a major gaff during the meeting by forgetting the client's name.
C2 noun /biˈætɪtjuːd/

beatitude

Meaning
supreme blessedness or happiness, often used in reference to the sayings of Jesus in the Sermon on the Mount
Example
She felt a state of beatitude after receiving the good news.
C2 adjective /ˌsæpəˈneɪʃəs/

saponaceous

Meaning
Soapy or having the qualities of soap.
Example
The plant has saponaceous leaves that produce foam when rubbed in water.
C2 noun /ˈɛskwaɪər/

esquire

Meaning
A title of respect often used after a man's name, especially for lawyers in the United States.
Example
John Smith, Esquire, will be representing the client in court.
C2 noun /trʌs/

truss

Meaning
a framework, typically consisting of rafters, posts, and struts, supporting a roof, bridge, or other structure
Example
The engineer designed a strong truss for the new bridge.
C2 noun /ˈʌmbrɪdʒ/

umbrage

Meaning
A feeling of resentment or offense.
Example
She took umbrage at his rude remark.
C2 verb /bɪˈfuːl/

befool

Meaning
to deceive or trick someone into believing something false; to make someone appear foolish
Example
The scammer tried to befool innocent people with fake promises.
C2 noun /ˈæmjʊlət/

Amulet

Meaning
an ornament or small piece of jewelry thought to give protection against evil, danger, or disease
Example
She wore a silver amulet around her neck for good luck.
C2 noun /ˈdʒɒs.stɪk/

Joss-stick

Meaning
a thin stick of incense that is burned for its pleasant smell, especially in religious ceremonies
Example
She lit a joss-stick in the temple during her prayers.
C2 noun /əˈnækrəˌnɪzəm/

anachronism

Meaning
something that is out of its proper time period, especially something old-fashioned in a modern context
Example
Using a typewriter today feels like an anachronism.
C2 adjective /ɪmˈprɛɡnəbl̩/

impregnable

Meaning
Unable to be captured, broken into, or defeated.
Example
The fortress was considered impregnable by the enemy.
C2 adjective /ˈklɔɪ.ɪŋ/

cloying

Meaning
too sweet, rich, or sentimental, making it unpleasant
Example
The dessert was so cloying that I couldn't finish it.
C2 adjective /ɔːˈrɪkjʊlər/

auricular

Meaning
Relating to the ear or hearing.
Example
The doctor used an auricular thermometer to check the patient's temperature.
C2 noun /ˈkɜːrtʃɪf/

kerchief

Meaning
a piece of cloth worn around the head or neck
Example
She wore a red kerchief on her head.
C2 noun /ɪɡˈzækʃən/

exaction

Meaning
the act of demanding or obtaining something, especially unfairly
Example
The peasants suffered under the king's heavy exactions.
C2 adjective /ˌɑːrbəˈrɛsənt/

arborescent

Meaning
having the appearance or characteristics of a tree; tree-like
Example
The coral had an arborescent form that resembled a miniature forest.
C2 noun /ˈhaɪərəˌɡlɪf/

hieroglyph

Meaning
A picture or symbol used in ancient writing systems, especially Egyptian writing.
Example
The walls of the temple were covered in hieroglyphs.
C2 noun /ˌɪkθiˈɒlədʒi/

ichthyology

Meaning
The branch of zoology that deals with fish.
Example
He pursued a degree in ichthyology at the university.
C2 noun /ˈæktʃuˌɛri/

actuary

Meaning
A professional who analyzes financial risk using mathematics, statistics, and financial theory, especially in insurance and pensions.
Example
The actuary calculated the risk before finalizing the insurance policy.
C2 adjective /ˈmʌɡi/

muggy

Meaning
uncomfortably warm and humid
Example
It was a muggy afternoon in July.
C2 noun əˌmæl.ɡəˈmeɪ.ʃən

amalgamation

Meaning
The action, process, or result of combining or uniting.
Example
The amalgamation of AI and big data is transforming industries.
C2 verb /dɪˈnjuːd/

denude

Meaning
to strip something of its covering, possessions, or assets
Example
The forest was denuded of trees by illegal logging.
C2 verb /ˈtʃɔːrtl/

chortle

Meaning
to laugh in a breathy, gleeful way
Example
The audience chortled at the comedian's witty remarks.
C2 noun /ˈsɜːrfɪt/

surfeit

Meaning
an excessive amount of something
Example
There was a surfeit of food at the festival.
C2 verb /ˈvæsɪleɪt/

vacillate

Meaning
to waver between different opinions or actions; be indecisive
Example
He vacillated between studying law and becoming a writer.
C2 adjective ˌeə.rəʊˈstæt.ɪk

aerostatic

Meaning
Relating to or involving gases (especially air) in equilibrium and the equilibrium of balloons or aircraft under the influence of such gases.
Example
Aerostatic designs ensure stability at high altitudes.
C2 noun /ˌlɪk.wəˈfeɪ.ʃənt/

liquefacient

Meaning
a substance that causes something to become liquid
Example
The chemist explained how the liquefacient worked in the experiment.
C2 noun əˌklaɪ.mə.tɪˈzeɪ.ʃən

acclimatization

Meaning
The process of adapting to a new environment or condition.
Example
The hikers needed time for acclimatization to high altitudes.
C2 adjective /trænzˈmɪsəbl/

transmissible

Meaning
able to be passed or spread from one person or thing to another
Example
COVID-19 is a highly transmissible disease.
C2 noun /ˌdɛprɪˈdeɪʃən/

depredation

Meaning
An act of attacking or plundering; damage caused by such acts.
Example
The villagers feared the depredation of wild animals at night.
C2 noun /ˈkjʊriˌoʊ/

curio

Meaning
a small unusual or interesting object, often collected for its rarity
Example
She bought a curio from the antique shop.
C2 verb /ˈædjʊˌleɪt/

adulate

Meaning
to praise or flatter excessively
Example
The fans adulated the actor after his performance.
C2 adjective /ˈæpəˌleɪt/

appellate

Meaning
relating to appeals in a court of law
Example
The case was taken to an appellate court.
C2 noun /traɪˈʌmvɪər/

triumvir

Meaning
One of a group of three men holding power in ancient Rome.
Example
Caesar was a triumvir in the first Roman triumvirate.