ecotoxicology
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C2 noun /ˌiː.kəʊ.tɒkˈsɪ.kə.lə.dʒi/

ecotoxicology

Meaning
The study of the effects of chemical pollution on the environment.
Example
Ecotoxicology studies the effects of pesticides on wildlife.
C2 adjective /ˈɛstɪməbl/

estimable

Meaning
Worthy of great respect.
Example
Her estimable achievements inspired the whole community.
C2 noun /ɪˈfʌldʒəns/

effulgence

Meaning
Brilliant radiance or shining brightness.
Example
The effulgence of the sunrise lit up the entire valley.
C2 noun /eɪˈklɑː/

eclat

Meaning
Brilliant success, acclaim, or great public approval.
Example
The artist's debut performance was met with great éclat.
C2 adjective /ˈɛrənt/

errant

Meaning
behaving wrongly or straying from the proper course or standards
Example
The teacher disciplined the errant student.
C2 adjective /ɛmˈpaɪriəl/

empyreal

Meaning
Heavenly, divine, or relating to the highest heavens.
Example
The poet described the empyreal beauty of the stars.
C2 adjective /ɪˈpɪstələri/

epistolary

Meaning
Related to the writing of letters; expressed in or through letters.
Example
The novel is written in an epistolary style, consisting of letters between characters.
C2 adjective /ˈɛdɪfaɪɪŋ/

edifying

Meaning
Providing moral or intellectual instruction or enlightenment.
Example
The documentary was both entertaining and edifying.
C2 noun /ɛnˈsɪklɪkəl/

encyclical

Meaning
a formal letter sent by the Pope to Catholic churches, usually addressing important issues
Example
The Pope issued an encyclical on climate change and moral responsibility.
C2 verb /ˌɛfəˈvɛs/

effervesce

Meaning
To give off bubbles of gas; to show excitement, liveliness, or enthusiasm.
Example
The soda began to effervesce as soon as it was opened.
C2 adjective /ˌɛkstrəˌdʒuːˈdɪʃəl/

extrajudicial

Meaning
done outside the authority of the legal system or judicial process
Example
The activists condemned the extrajudicial killings.
C2 noun /juːˈdʒen.ɪks/

eugenics

Meaning
the study or practice of improving the genetic quality of the human population
Example
Eugenics has been criticized for its unethical applications in history.
C2 noun /ˈɪrˌʃɑːt/

earshot

Meaning
the range or distance within which a sound can be heard
Example
The children whispered secrets out of earshot of their parents.
C2 verb /ˈɛksplɪkeɪt/

explicate

Meaning
to make an idea or principle clear by explaining it in detail
Example
The professor tried to explicate the theory of relativity for his students.
C2 verb /ɪkˈspeɪʃiˌeɪt/

expatiate

Meaning
to speak or write at length or in detail
Example
The professor expatiated on the importance of critical thinking.
C2 adjective /ɪˈfʌldʒənt/

effulgent

Meaning
Shining brilliantly; radiant.
Example
Her effulgent smile brightened everyone's mood.
C2 verb /ɛnˈkɪndl/

enkindle

Meaning
to set on fire or inspire strong emotion
Example
The speech enkindled hope in the audience.
C2 adjective /ˌɛfəˈvɛsənt/

effervescent

Meaning
Giving off bubbles; lively, enthusiastic, and full of energy.
Example
She had an effervescent personality that brightened every room.
C2 noun /ˈjuːfəni/

euphony

Meaning
The quality of being pleasing to the ear, especially through harmonious combination of words.
Example
The orator's speech was full of euphony and rhythm.
C2 verb /ɛksˈproʊprieɪt/

expropriate

Meaning
To take property from its owner, especially by authority or for public use.
Example
The government decided to expropriate the land for a new highway.
C2 verb /ɪnˈtwaɪn/

entwine

Meaning
to twist or wind together; to become closely connected or involved
Example
The vines entwine around the old fence.
C2 noun ˈɛn.ɡræm

Engram

Meaning
Physical signs or patterns in the brain for memory storage and retrieval
Example
Scientists study engrams to understand how memories are stored.
C2 verb /ɪkˈspɒstjʊleɪt/

expostulate

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

evenhanded

Meaning
Fair and impartial; showing no bias or favoritism.
Example
The judge was praised for her evenhanded approach to the case.
C2 verb /ˈeksɪkreɪt/

execrate

Meaning
To feel or express great loathing or hatred for something.
Example
The community execrated the corrupt politician.
C2 noun /ˈɛdi/

eddy

Meaning
A circular movement of water, air, or smoke, counter to the main current, causing a small whirlpool or turbulence.
Example
The canoe was caught in an eddy near the rocks.
C2 adjective /ˈɪrˌsplɪtɪŋ/

earsplitting

Meaning
extremely loud or piercing sound
Example
The earsplitting noise of the fire alarm startled everyone.
C2 adjective /ˈɛrzæts/

ersatz

Meaning
made or used as a substitute, typically an inferior one
Example
The cheap shoes were made of ersatz leather.
C2 verb /ɪˈmɛnd/

emend

Meaning
to correct or revise a text, especially for errors
Example
The editor emended the manuscript before publication.
C2 noun /ˈɛpəlɛt/

epaulet

Meaning
An ornamental shoulder piece on a garment, especially on the coat or jacket of a military uniform.
Example
The general’s uniform had a golden epaulet on each shoulder.
C2 adjective /ˈeksɪkrəbl/

execrable

Meaning
Extremely bad or unpleasant.
Example
The movie was so execrable that many people left the theater early.
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 adjective /ˌɛlɪˈfæntaɪn/

elephantine

Meaning
Huge, clumsy, or resembling an elephant in size or movement.
Example
The man moved with an elephantine grace.
C2 noun /ɪˈskʌtʃən/

escutcheon

Meaning
a shield or emblem bearing a coat of arms
Example
The family crest was displayed on the escutcheon above the fireplace.
C2 noun /ˈel.ɪ.fənt ˈæp.əl/

Elephant Apple

Meaning
a tropical fruit with a hard shell and acidic flesh
Example
Elephant apple is used to make delicious jams and pickles.
C2 verb /ˈɛmɪt/

emmet

Meaning
an ant; a small insect
Example
The emmet carried food to its nest.
C2 verb /ɪkˈstruːd/

extrude

Meaning
to force something out through a small opening; to shape by pushing material through a mold
Example
The factory extrudes plastic pipes using modern machines.
C2 noun /ˈaɪ.sɔːr/

Eyesore

Meaning
something that is very ugly and unpleasant to look at
Example
The abandoned building has become an eyesore in the neighborhood.
C2 adjective /ɪkˈskɜːsɪv/

excursive

Meaning
Tending to digress or wander; moving away from the main subject.
Example
His excursive lecture left the students confused about the main topic.
C2 noun /ɪkˈsɪʒən/

excision

Meaning
the act of cutting something out, especially by surgical removal
Example
The excision of the infected tissue prevented further complications.
C2 adjective /ˈɛksplɪkəbəl/

explicable

Meaning
able to be explained or understood
Example
His sudden anger was explicable given the stressful situation.
C2 verb /ˌɛvəˈnɛs/

evanesce

Meaning
To disappear gradually; to fade away.
Example
The mist began to evanesce as the sun rose higher.
C2 verb /ɪˈvɪns/

evince

Meaning
to show or demonstrate clearly
Example
She evinced her interest in the project through active participation.
C2 verb /ɪnˈkʌmbər/

encumber

Meaning
to burden or weigh down something, making it difficult to move or progress
Example
She was encumbered by the heavy luggage during her journey.
C2 adjective /ɪkˈspɒzɪtəri/

expository

Meaning
intended to explain or describe something
Example
The teacher gave an expository lecture on the topic.
C2 verb /ɪnˈsnɛər/

ensnare

Meaning
to catch or trap, often by trickery or deceit
Example
The hunter ensnared the rabbit with a net.
C2 noun /ɪˈmɒljʊmənt/

emolument

Meaning
payment for work or services; salary or fees
Example
The professor received his annual emolument from the university.
C2 noun /ɪˌpɪstəˈmɒlədʒɪst/

epistemologist

Meaning
A scholar or expert who studies the nature, sources, and limits of knowledge.
Example
The epistemologist debated how humans can truly know anything with certainty.
C2 noun /ˈɛpənɪm/

eponym

Meaning
A person after whom a discovery, invention, place, or other thing is named.
Example
Sandwich is an eponym named after the Earl of Sandwich.
C2 noun /ɪˌkliːziˈæstɪk/

ecclesiastic

Meaning
A member of the clergy or church official.
Example
The council was attended by several high-ranking ecclesiastics.
C2 adjective /ˌeθ.noʊˈsen.trɪk/

ethnocentric

Meaning
evaluating other cultures according to the standards of one's own culture
Example
His ethnocentric attitude made it hard for him to appreciate foreign traditions.
C2 noun /ˈɛpəʊd/

epode

Meaning
A form of lyric poem written in couplets, often following a strophe and antistrophe in classical Greek poetry.
Example
The poet concluded his ode with a striking epode.
C2 noun /ɪˌpɪstəˈmɒlədʒi/

epistemology

Meaning
The branch of philosophy that studies the nature, origin, and scope of knowledge.
Example
Epistemology explores the difference between justified belief and opinion.
C2 noun /ɪˈmɛtɪk/

emetic

Meaning
a substance that causes vomiting
Example
The doctor administered an emetic to remove the poison.
C2 verb /ɛksˈhjuːm/

exhume

Meaning
to dig out something buried, especially a body from the ground
Example
The archaeologists decided to exhume the ancient remains.
C2 noun /ˌɛksɪˈɡjuːɪti/

exiguity

Meaning
the quality of being scanty or meager in amount
Example
The exiguity of resources made the project difficult to complete.
C2 adjective /ˌɛf.ɪˈkeɪ.ʃəs/

efficacious

Meaning
Successful in producing a desired or intended result; effective.
Example
The vaccine proved highly efficacious in preventing infections.
C2 adjective /ɪkˈstɛnsəbl/

extensible

Meaning
able to be extended; capable of expansion.
Example
The software is designed to be extensible with new features.
C2 noun /ˈɛksɪdʒənsi/

exigency

Meaning
an urgent need or demand requiring immediate attention
Example
In times of war, the exigency of the situation requires quick decisions.
C2 noun /ɪˈlɪksər/

elixir

Meaning
A magical or medicinal potion believed to cure illnesses or grant immortality.
Example
The old legend spoke of an elixir that could grant eternal youth.
C2 noun /ɪkˈspiːdiənsi/

expediency

Meaning
the quality of being convenient and practical despite possibly being improper or immoral
Example
He acted out of political expediency rather than principle.
C2 verb /ɪkˈspɛktəreɪt/

expectorate

Meaning
to cough up and spit out mucus from the throat or lungs
Example
The patient began to expectorate thick mucus.
C2 noun /ɛmˈpɪrɪˌsɪzəm/

empiricism

Meaning
the theory that all knowledge is derived from sense-experience
Example
Empiricism argues that knowledge comes from experience and observation.
C2 noun /ˈɛpɪkjʊr/

epicure

Meaning
A person who enjoys fine food and drink, often with refined taste.
Example
As an epicure, she always sought out the finest restaurants in the city.
C2 adjective /ɪˈkwɪvəkəl/

equivocal

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

eon

Meaning
an indefinitely long period of time; an age
Example
Dinosaurs lived millions of years ago, in a different eon.
C2 noun /ˈɛksplətɪv/

expletive

Meaning
a word or phrase used as an exclamation, often offensive or profane
Example
He shouted an expletive when he dropped the hammer on his foot.
C2 adjective /ˌɛpɪkjʊˈriːən/

epicurean

Meaning
relating to the enjoyment of fine food, drink, and luxury
Example
The chef prepared an epicurean feast for the guests.
C2 noun /ˈɛkwɪpɪdʒ/

equipage

Meaning
Equipment or a carriage with its accessories.
Example
The nobleman arrived in a grand equipage.
C2 verb /ˈeksɔːrsaɪz/

exorcise

Meaning
To drive out an evil spirit or bad influence through rituals or prayers.
Example
The priest was called to exorcise the spirit from the house.
C2 noun /ˌɛpɪzəʊˈɒtɪk/

epizootic

Meaning
An outbreak of disease affecting many animals of one kind at the same time.
Example
The farmer feared an epizootic might wipe out his cattle.
C2 noun /juː/

Ewe

Meaning
a female sheep
Example
The ewe gave birth to twin lambs.
C2 verb /ɪkˈstɛmpəraɪz/

extemporize

Meaning
To speak or perform without preparation; improvise.
Example
The actor had to extemporize when he forgot his lines.
C2 verb /ɪɡˈzʌlt/

exult

Meaning
to show or feel great joy, often as a result of success
Example
The fans exulted after their team won the championship.
C2 noun /ˈjuːər/

ewer

Meaning
a large jug with a wide mouth, especially used in the past for carrying water
Example
The servant filled the ewer with fresh water.
C2 verb /ɪnˈdjuː/

endue

Meaning
To provide or endow with a quality or ability.
Example
The leader was endued with wisdom and courage.
C2 noun /ˈɛndaɪv/ or /ˈɑːndɪv/

endive

Meaning
A leafy vegetable belonging to the chicory family, often used in salads.
Example
She added fresh endive to the salad for a slightly bitter flavor.
C2 noun /ɪkˈstɛnsər/

extensor

Meaning
a muscle that serves to extend or straighten a limb or part of the body.
Example
The extensor muscles in the arm help straighten the elbow.
C2 verb /ɪˈfjuːz/

effuse

Meaning
To pour out or express feelings freely and openly.
Example
She effused gratitude for the help she received.
C2 noun /ɪnˈtriːti/

entreaty

Meaning
An earnest or humble request or plea.
Example
She made an entreaty for peace during the heated argument.
C2 noun /ɪˈklɛktɪˌsɪzəm/

eclecticism

Meaning
A method or practice of deriving ideas, style, or taste from a broad and diverse range of sources.
Example
The architect’s work shows eclecticism by blending modern and traditional elements.
C2 noun /ɪˌnʌn.siˈeɪ.ʃən/

enunciation

Meaning
The act of saying or pronouncing words clearly and distinctly.
Example
His enunciation was clear during the presentation.
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 /ˈiːɡlət/

eaglet

Meaning
A young eagle.
Example
The eaglet waited in the nest for its mother to return.
C2 verb /ɪnˈθroʊn/

enthrone

Meaning
to install someone on a throne or to give someone high status
Example
The king was enthroned in a grand ceremony.
C2 adjective /ˌɛvɪˈdɛnʃəl/

evidential

Meaning
relating to or providing evidence
Example
The lawyer presented evidential support for her claims.
C2 noun /ɪˈfluːviəm/

effluvium

Meaning
an unpleasant or harmful odor, secretion, or discharge
Example
The effluvium from the factory spread across the neighborhood.
C2 noun /ɪˌdʒækjʊˈleɪʃən/

ejaculation

Meaning
The action of suddenly saying something or the release of semen during sexual climax.
Example
His sudden ejaculation of joy surprised everyone in the room.
C2 verb /ɪnˈsaɪfər/

encipher

Meaning
to convert a message into code or cipher
Example
The agent enciphered the secret message before sending it.
C2 adjective /juːˈdʒɛnɪk/

eugenic

Meaning
Relating to or aiming at improving the genetic quality of a population.
Example
In the early 20th century, some scientists supported eugenic policies.
C2 adjective /ɪˈfɛktʃuəl/

effectual

Meaning
producing a desired or intended effect, often used in formal contexts
Example
Her effectual efforts brought peace to the community.
C2 adjective /ˈek.wə.bəl/

Equable

Meaning
calm and even-tempered; not easily disturbed
Example
He maintained an equable temperament throughout the crisis.
C2 noun /ˈeb.taɪd/

Ebb-tide

Meaning
the movement of the tide out to sea; a time when the sea level is falling
Example
During ebb-tide, we could walk further out on the beach.
C2 adjective /ɪˈmɛrɪtəs/

emeritus

Meaning
having retired but allowed to retain their title as an honor
Example
He is a professor emeritus at the university.
C2 verb /ɛmˈbleɪzən/

emblazon

Meaning
To decorate or display something in a noticeable or impressive way.
Example
The team's logo was emblazoned on their uniforms.
C2 noun /ɪkˈskrɛsəns/

excrescence

Meaning
An abnormal outgrowth or lump, often considered unattractive.
Example
The building was considered an excrescence on the landscape.
C2 noun ˌiːkwəˈnɪməti

equanimity

Meaning
Mental calmness, composure, and evenness of temper, especially in a difficult situation.
Example
She handled the news with remarkable equanimity.
C2 noun /ˈɛnsaɪn/

ensign

Meaning
A flag or standard, especially a military or naval one indicating nationality; also a junior officer in the navy or coast guard.
Example
The ship raised its national ensign before leaving the harbor.
C2 verb /ɛnˈfiːbəl/

enfeeble

Meaning
To make weak or feeble; to deprive of strength.
Example
The long illness enfeebled the old man.
C2 verb /ɛkˈskɔːrieɪt/

excoriate

Meaning
To strongly criticize someone; to denounce severely.
Example
The critic excoriated the film for its poor script.
C2 verb /ɪˈfeɪsɪŋ/

effacing

Meaning
erasing or making oneself inconspicuous; to remove or diminish in significance
Example
She kept effacing herself during the meeting so that others could shine.
C2 noun /ˌɛksəˈdʒiːsɪs/

exegesis

Meaning
A critical explanation or interpretation of a text, especially a religious scripture.
Example
The professor gave a detailed exegesis of the biblical passage.
C2 adjective /ɛɡˈzɪɡjuəs/

exiguous

Meaning
small in amount; scanty or inadequate
Example
They survived on exiguous rations during the journey.
C2 adjective /ˌɛl.ɪˈdʒaɪ.ək/

elegiac

Meaning
Expressing sorrow, often for something past; resembling an elegy.
Example
The novel ends on an elegiac note, mourning the lost era.
C2 adjective /ˌɛfləˈrɛsənt/

efflorescent

Meaning
in the process of blooming or flourishing
Example
The efflorescent trees made the park look beautiful.
C2 adjective /ˌɛl.ɪˈmɑː.səˌnɛr.i/

eleemosynary

Meaning
Relating to charity; dependent on or supported by charity.
Example
The hospital was founded as an eleemosynary institution.
C2 verb /ɛnˈdʒɔɪn/

enjoin

Meaning
to instruct or urge someone to do something; to prohibit legally
Example
The judge enjoined the company from continuing its activities.
C2 noun /ˈɛpɪtɑːf/

epitaph

Meaning
A short text written on a tombstone in memory of the deceased.
Example
The gravestone bore an epitaph honoring the soldier’s bravery.
C2 noun ˌɛr.jʊˈdɪʃ.ən

erudition

Meaning
The quality of having or showing great knowledge or learning; scholarship.
Example
His erudition in history impressed the entire audience.
C2 noun /juːˌtrɑː.fɪˈkeɪ.ʃən/

eutrophication

Meaning
Excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.
Example
Excess fertilizers lead to eutrophication in lakes.
C2 noun /ˈɒnwiː/ or /ˈɑːnwiː/

ennui

Meaning
A feeling of boredom, listlessness, or dissatisfaction arising from lack of excitement.
Example
After weeks of doing nothing, he sank into a deep sense of ennui.
C2 adjective /ˈɛnərˌveɪtɪd/

enervated

Meaning
Lacking energy, vitality, or strength; weakened or exhausted.
Example
After the long meeting, she felt completely enervated.
C2 verb /ɪˈdjuːs/

educe

Meaning
To draw out or bring forth something latent or hidden.
Example
The teacher tried to educe a response from the shy student.
C2 adjective /ˌɛvəˈnɛsənt/

evanescent

Meaning
Quickly fading or disappearing; lasting for only a very short time.
Example
The beauty of the sunset was evanescent, fading within minutes.
C2 adjective /ˌɛkspəˈdɪʃəs/

expeditious

Meaning
Done with speed and efficiency.
Example
The expeditious delivery of the package was appreciated.
C2 noun /ɪɡˈzɔːrbɪtəns/

exorbitance

Meaning
The quality of being excessive, unreasonable, or going beyond proper limits.
Example
The exorbitance of the hotel's prices shocked the tourists.
C2 noun /ˌɛpɪˈsaɪklɔɪd/

epicycloid

Meaning
a curve traced by a point on the circumference of a circle that rolls around the outside of another circle
Example
The mathematician demonstrated how to draw an epicycloid.
C2 noun /ɪˈpɪsəl/

epistle

Meaning
A letter, especially a formal or didactic one; often used for letters in the New Testament.
Example
He wrote a long epistle to his friend about his travels.
C2 adjective ˈɛr.jʊ.daɪt

erudite

Meaning
Having or showing great knowledge or learning; scholarly and intellectual.
Example
The professor's erudite lecture fascinated the students.
C2 verb /ɛmˈbɔs/

emboss

Meaning
to decorate a surface with a raised design or pattern
Example
The invitation card was embossed with golden letters.
C2 noun /ˈɛmbəˌlɪzəm/

embolism

Meaning
the sudden blockage of a blood vessel by a clot or other foreign matter
Example
The patient suffered a fatal pulmonary embolism.