| chronic | (adjective) being long-lasting and recurrent or characterized by long suffering | - |
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| (adjective) persisting for a long time | Synonyms: continuing |
| (adjective) habitual | Synonyms: inveterate |
| chronically | (adverb) in a slowly developing and long lasting manner | - |
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| (adverb) in a habitual and longstanding manner | Synonyms: inveterate |
| chronicle | (noun) a record or narrative description of past events | Synonyms: account, history, story |
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| (verb) record in chronological order; make a historical record | - |
| chronicler | (noun) someone who writes chronicles | - |
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| chronograph | (noun) an accurate timer for recording time | - |
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| chronological | (adjective) relating to or arranged according to temporal order | - |
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| chronologically | (adverb) with respect to chronology | - |
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| chronologise | (verb) establish the order in time of something | Synonyms: chronologize |
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| chronologize | (verb) establish the order in time of something | Synonyms: chronologise |
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| chronology | (noun) the determination of the actual temporal sequence of past events | - |
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| (noun) a record of events in the order of their occurrence | - |
| (noun) an arrangement of events in time | - |
| chronometer | (noun) an accurate clock (especially used in navigation) | - |
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| chronoscope | (noun) an instrument for accurate measurements of small intervals of time | - |
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| chylomicron | (noun) a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood | - |
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| cicerone | (noun) a guide who conducts and informs sightseers | - |
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| cimarron | (noun) wild sheep of mountainous regions of western North America having massive curled horns | Synonyms: bighorn, bighorn sheep, Ovis canadensis, Rocky Mountain bighorn, Rocky Mountain sheep |
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| cistron | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: factor, gene |
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| citron | (noun) large lemonlike fruit with thick aromatic rind; usually preserved | - |
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| (noun) thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind | Synonyms: citron tree, Citrus medica |
| citronwood | (noun) wood of a citron tree | - |
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| (noun) durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain) | Synonyms: sandarac |
| coelenteron | (noun) the saclike body cavity of a coelenterate | - |
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| confront | (verb) deal with (something unpleasant) head on | Synonyms: face, face up |
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| (verb) present somebody with something, usually to accuse or criticize | Synonyms: face, present |
| (verb) oppose, as in hostility or a competition | Synonyms: face |
| (verb) be face to face with | - |
| confrontation | (noun) the act of hostile groups opposing each other | Synonyms: opposition |
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| (noun) a focussed comparison; bringing together for a careful comparison | - |
| (noun) a hostile disagreement face-to-face | Synonyms: encounter, face-off, showdown |
| (noun) a bold challenge | - |
| (noun) discord resulting from a clash of ideas or opinions | - |
| confrontational | (adjective) of or relating to confrontation | - |
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| corona | (noun) a long cigar with blunt ends | - |
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| (noun) (anatomy) any structure that resembles a crown in shape | - |
| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: aureole |
| (noun) an electrical discharge accompanied by ionization of surrounding atmosphere | Synonyms: corona discharge, corposant, electric glow, Saint Elmo's fire, Saint Elmo's light, Saint Ulmo's fire, Saint Ulmo's light, St. Elmo's fire |
| (noun) one or more circles of light seen around a luminous object | - |
| (noun) (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower | - |
| (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, coronavirus, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
| coronach | (noun) a song or hymn of mourning composed or performed as a memorial to a dead person | Synonyms: dirge, lament, requiem, threnody |
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| coronal | (noun) flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes | Synonyms: chaplet, garland, lei, wreath |
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| coronary | (adjective) surrounding like a crown (especially of the blood vessels surrounding the heart) | - |
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| (noun) obstruction of blood flow in a coronary artery by a blood clot (thrombus) | Synonyms: coronary thrombosis |
| coronate | (verb) invest with regal power; enthrone | Synonyms: crown |
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| coronation | (noun) the ceremony of installing a new monarch | Synonyms: enthronement, enthronisation, enthronization, investiture |
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| coronavirus | (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, corona, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
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| coroner | (noun) a public official who investigates by inquest any death not due to natural causes | Synonyms: medical examiner |
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| coronet | (noun) margin between the skin of the pastern and the horn of the hoof | - |
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| (noun) a small crown; usually indicates a high rank but below that of sovereign | - |
| coroneted | (adjective) belonging to the peerage | Synonyms: highborn, titled |
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| coronilla | (noun) any of various plants of the genus Coronilla having purple or pink or yellow flowers in long axillary heads or umbels | - |
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| coronion | (noun) the craniometric point at the tip of the coronoid process of the mandible | - |
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| corticosterone | (noun) secreted by the adrenal cortex; involved in regulating water and electrolyte balance in the body | - |
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| cosmotron | (noun) a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons | - |
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| coumarone | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: benzofuran, cumarone |
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| crone | (noun) an ugly evil-looking old woman | Synonyms: beldam, beldame, hag, witch |
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| cronk | (verb) utter a hoarse sound, like a raven | Synonyms: croak |
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| (verb) cry like a goose | Synonyms: honk |
| crony | (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, buddy, chum, pal, sidekick |
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| cronyism | (noun) favoritism shown to friends and associates (as by appointing them to positions without regard for their qualifications) | - |
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| cumarone | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: benzofuran, coumarone |
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| cupronickel | (noun) a 60/40 alloy of copper and nickel | - |
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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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| decahedron | (noun) any polyhedron having ten plane faces | - |
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| desynchronisation | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, asynchrony, desynchronization, desynchronizing |
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| desynchronise | (verb) cause to become desynchronized; cause to occur at unrelated times | Synonyms: desynchronize |
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| desynchronization | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, asynchrony, desynchronisation, desynchronizing |
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| desynchronize | (verb) cause to become desynchronized; cause to occur at unrelated times | Synonyms: desynchronise |
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| desynchronizing | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, asynchrony, desynchronisation, desynchronization |
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| dethrone | (verb) remove a monarch from the throne | - |
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| dethronement | (noun) the act of deposing someone; removing a powerful person from a position or office | Synonyms: deposition |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| diachronic | (adjective) used of the study of a phenomenon (especially language) as it changes through time | Synonyms: historical |
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| diachrony | (noun) the study of linguistic change | Synonyms: diachronic linguistics, historical linguistics |
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| dipteron | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteran, dipterous insect, two-winged insects |
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| dodecahedron | (noun) any polyhedron having twelve plane faces | - |
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| dronabinol | (noun) psychoactive substance present in marijuana; used therapeutically to control nausea associated with cancer therapy | - |
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| drone | (noun) stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen | - |
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| (noun) a pipe of the bagpipe that is tuned to produce a single continuous tone | Synonyms: bourdon, drone pipe |
| (noun) an aircraft without a pilot that is operated by remote control | Synonyms: pilotless aircraft, radio-controlled aircraft |
| (noun) an unchanging intonation | Synonyms: droning, monotone |
| (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, laggard, lagger, poke, trailer |
| (verb) talk in a monotonous voice | Synonyms: drone on |
| (verb) make a monotonous low dull sound | - |
| droning | (noun) an unchanging intonation | Synonyms: drone, monotone |
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| effrontery | (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: assumption, presumption, presumptuousness |
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| electron | (noun) an elementary particle with negative charge | Synonyms: negatron |
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| electronegative | (adjective) having a negative charge | Synonyms: negative, negatively charged |
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| electronegativity | (noun) (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond | Synonyms: negativity |
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| electroneutral | (adjective) having no net electric charge | Synonyms: neutral |
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| electronic | (adjective) of or relating to electronics; concerned with or using devices that operate on principles governing the behavior of electrons | - |
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| (adjective) of or concerned with electrons | - |
| electronically | (adverb) by electronic means | - |
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| electronics | (noun) the branch of physics that deals with the emission and effects of electrons and with the use of electronic devices | - |
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| elytron | (noun) either of the horny front wings in beetles and some other insects which cover and protect the functional hind wings | Synonyms: wing case |
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| enteron | (noun) the alimentary canal (especially of an embryo or a coelenterate) | - |
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| enthrone | (verb) put a monarch on the throne | Synonyms: throne |
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| (verb) provide with power and authority | Synonyms: invest, vest |
| enthronement | (noun) the ceremony of installing a new monarch | Synonyms: coronation, enthronisation, enthronization, investiture |
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| enthronisation | (noun) the ceremony of installing a new monarch | Synonyms: coronation, enthronement, enthronization, investiture |
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| enthronization | (noun) the ceremony of installing a new monarch | Synonyms: coronation, enthronement, enthronisation, investiture |
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| environ | (verb) extend on all sides of simultaneously; encircle | Synonyms: border, ring, skirt, surround |
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| environment | (noun) the area in which something exists or lives | Synonyms: environs, surround, surroundings |
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| (noun) the totality of surrounding conditions | - |
| environmental | (adjective) concerned with the ecological effects of altering the environment | - |
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| (adjective) of or relating to the external conditions or surroundings | - |
| environmentalism | (noun) the activity of protecting the environment from pollution or destruction | - |
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| (noun) the philosophical doctrine that environment is more important than heredity in determining intellectual growth | - |
| environmentalist | (noun) someone who works to protect the environment from destruction or pollution | Synonyms: conservationist |
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| environmentally | (adverb) for the environment | - |
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| environs | (noun) the area in which something exists or lives | Synonyms: environment, surround, surroundings |
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| (noun) an outer adjacent area of any place | Synonyms: purlieu |
| ephemeron | (noun) anything short-lived, as an insect that lives only for a day in its winged form | Synonyms: ephemeral |
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| epidendron | (noun) any of various orchids of the genus Epidendrum | - |
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| erroneous | (adjective) containing or characterized by error | - |
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| erroneously | (adverb) in a mistaken or erroneous manner | Synonyms: mistakenly |
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| erroneousness | (noun) inadvertent incorrectness | Synonyms: error |
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| estrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: Estronol, oestrone, theelin |
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| euronithopod | (noun) widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon) | Synonyms: Euronithopoda, Ornithopoda, suborder Euronithopoda, suborder Ornithopoda |
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| flatiron | (noun) an iron that was heated by placing it on a stove | - |
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| forefront | (noun) the position of greatest importance or advancement; the leading position in any movement or field | Synonyms: cutting edge, vanguard |
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| (noun) the part in the front or nearest the viewer | Synonyms: head |
| frond | (noun) compound leaf of a fern or palm or cycad | - |
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| front | (adjective) relating to or located in the front | - |
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| (noun) the side that is seen or that goes first | - |
| (noun) the outward appearance of a person | - |
| (noun) a group of people with a common ideology who try together to achieve certain general goals | Synonyms: movement, social movement |
| (noun) the side that is forward or prominent | Synonyms: forepart, front end |
| (noun) the line along which opposing armies face each other | Synonyms: battlefront, front line |
| (noun) the part of something that is nearest to the normal viewer | - |
| (noun) the immediate proximity of someone or something | Synonyms: presence |
| (noun) a person used as a cover for some questionable activity | Synonyms: figurehead, front man, nominal head, straw man, strawman |
| (noun) (meteorology) the atmospheric phenomenon created at the boundary between two different air masses | - |
| (noun) a sphere of activity involving effort | - |
| (verb) confront bodily | Synonyms: breast |
| (verb) be oriented in a certain direction, often with respect to another reference point; be opposite to | Synonyms: face, look |
| frontage | (noun) the face or front of a building | Synonyms: facade, frontal |
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| (noun) the extent of land abutting on a street or water | - |
| (noun) the direction in which something (such as a building) faces | - |
| frontal | (adjective) of or relating to the front of an advancing mass of air | - |
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| (adjective) meeting front to front | Synonyms: head-on |
| (adjective) belonging to the front part | - |
| (adjective) of or adjacent to the forehead or frontal bone | - |
| (noun) an adornment worn on the forehead | Synonyms: frontlet |
| (noun) a drapery that covers the front of an altar | - |
| (noun) the face or front of a building | Synonyms: facade, frontage |
| frontally | (adverb) in, at, or toward the front | - |
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| frontbencher | (noun) a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party | - |
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| frontier | (noun) an undeveloped field of study; a topic inviting research and development | - |
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| (noun) a wilderness at the edge of a settled area of a country | - |
| (noun) an international boundary or the area (often fortified) immediately inside the boundary | - |
| frontiersman | (noun) a man who lives on the frontier | Synonyms: backwoodsman, mountain man |
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| frontierswoman | (noun) a woman who lives on the frontier | - |
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| frontispiece | (noun) front illustration facing the title page of a book | - |
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| (noun) an ornamental facade | - |