| antiparticle | (noun) a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy | - |
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| appendicle | (noun) a small appendage | - |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| article | (noun) one of a class of artifacts | - |
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| (noun) nonfictional prose forming an independent part of a publication | - |
| (noun) (grammar) a determiner that may indicate the specificity of reference of a noun phrase | - |
| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: clause |
| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| auricle | (noun) a small conical pouch projecting from the upper anterior part of each atrium of the heart | Synonyms: atrial auricle, auricula atrii |
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| (noun) the externally visible cartilaginous structure of the external ear | Synonyms: ear, pinna |
| barnacle | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: cirriped, cirripede |
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| (noun) European goose smaller than the brant; breeds in the far north | Synonyms: barnacle goose, Branta leucopsis |
| bicycle | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bike, cycle, wheel |
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| bicycler | (noun) a person who rides a bicycle | Synonyms: bicyclist, biker, cyclist, wheeler |
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| binnacle | (noun) a nonmagnetic housing for a ship's compass (usually in front of the helm) | - |
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| boucle | (noun) a fabric of uneven yarn that has an uneven knobby effect | - |
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| calycle | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: caliculus, calyculus |
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| (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calyculus, epicalyx, false calyx |
| canticle | (noun) a hymn derived from the Bible | - |
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| carbuncle | (noun) an infection larger than a boil and with several openings for discharge of pus | - |
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| (noun) deep-red cabochon garnet cut without facets | - |
| caruncle | (noun) an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds | Synonyms: caruncula |
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| chicle | (noun) gum-like substance from the sapodilla | Synonyms: chicle gum |
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| chronicle | (noun) a record or narrative description of past events | Synonyms: account, history, story |
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| chronicler | (noun) someone who writes chronicles | - |
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| circle | (noun) movement once around a course | Synonyms: circuit, lap |
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| (noun) any circular or rotating mechanism | Synonyms: round |
| (noun) a road junction at which traffic streams circularly around a central island | Synonyms: rotary, roundabout, traffic circle |
| (noun) a curved section or tier of seats in a hall or theater or opera house; usually the first tier above the orchestra | Synonyms: dress circle |
| (noun) street names for flunitrazepam | Synonyms: forget me drug, Mexican valium, R-2, roach, roofy, rope, rophy |
| (noun) an unofficial association of people or groups | Synonyms: band, lot, set |
| (noun) ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point | - |
| (noun) something approximating the shape of a circle | - |
| circlet | (noun) decorated metal band worn around the head | - |
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| (noun) a small circle | - |
| clavicle | (noun) bone linking the scapula and sternum | Synonyms: collarbone |
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| clean | (noun) a weightlift in which the barbell is lifted to shoulder height and then jerked overhead | Synonyms: clean and jerk |
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| cleaner | (noun) a preparation used in cleaning something | Synonyms: cleanser, cleansing agent |
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| (noun) someone whose occupation is cleaning | - |
| (noun) the operator of dry-cleaning establishment | Synonyms: dry cleaner |
| cleaners | (noun) shop where dry cleaning is done | Synonyms: dry cleaners |
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| cleaning | (noun) the act of making something clean | Synonyms: cleansing, cleanup |
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| cleanliness | (noun) diligence in keeping clean | - |
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| (noun) the habit of keeping free of superficial imperfections | - |
| cleanness | (noun) the state of being clean; without dirt or other impurities | - |
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| (noun) without moral defects | - |
| cleanser | (noun) a preparation used in cleaning something | Synonyms: cleaner, cleansing agent |
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| cleansing | (noun) the act of making something clean | Synonyms: cleaning, cleanup |
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| cleanup | (noun) the act of making something clean | Synonyms: cleaning, cleansing |
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| (noun) (baseball) the fourth position in the batting order (usually filled by the best batter on the team) | Synonyms: cleanup position, cleanup spot |
| (noun) a very large profit | Synonyms: killing |
| clear | (noun) a clear or unobstructed space or expanse of land or water | Synonyms: open |
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| (noun) the state of being free of suspicion | - |
| clearance | (noun) permission to proceed | - |
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| (noun) the distance by which one thing clears another; the space between them | - |
| (noun) vertical space available to allow easy passage under something | Synonyms: headroom, headway |
| clearcutness | (noun) clarity as a consequence of precision | Synonyms: preciseness |
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| clearing | (noun) the act of freeing from suspicion | - |
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| (noun) the act of removing solid particles from a liquid | Synonyms: clarification |
| (noun) a tract of land with few or no trees in the middle of a wooded area | Synonyms: glade |
| clearness | (noun) free from obscurity and easy to understand; the comprehensibility of clear expression | Synonyms: clarity, limpidity, lucidity, lucidness, pellucidity |
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| (noun) the quality of clear water | Synonyms: clarity, uncloudedness |
| clearstory | (noun) part of an interior wall rising above the adjacent roof with windows admitting light | Synonyms: clerestory |
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| clearway | (noun) a road on which you are not allowed to stop (unless you have a breakdown) | - |
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| clearweed | (noun) a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves | Synonyms: dead nettle, Pilea pumilla, richweed |
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| cleat | (noun) a strip of wood or metal used to strengthen the surface to which it is attached | - |
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| (noun) a fastener (usually with two projecting horns) around which a rope can be secured | - |
| (noun) a metal or leather projection (as from the sole of a shoe); prevents slipping | - |
| cleats | (noun) shoes with leather or metal projections on the soles | - |
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| cleavage | (noun) the act of cleaving or splitting | - |
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| (noun) the line formed by a groove between two parts (especially the separation between a woman's breasts) | - |
| (noun) (embryology) the repeated division of a fertilised ovum | Synonyms: segmentation |
| (noun) the breaking of a chemical bond in a molecule resulting in smaller molecules | - |
| (noun) the state of being split or cleft | - |
| cleaver | (noun) a butcher's knife having a large square blade | Synonyms: chopper, meat cleaver |
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| cleavers | (noun) annual having the stem beset with curved prickles; North America and Europe and Asia | Synonyms: catchweed, clivers, Galium aparine, goose grass, spring cleavers |
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| clef | (noun) a musical notation written on a staff indicating the pitch of the notes following it | - |
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| cleft | (noun) a long narrow cleft | Synonyms: crack, crevice, fissure, scissure |
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| (noun) a split or indentation in something (as the palate or chin) | - |
| cleg | (noun) large swift fly the female of which sucks blood of various animals | Synonyms: clegg, horse fly, horsefly |
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| clegg | (noun) large swift fly the female of which sucks blood of various animals | Synonyms: cleg, horse fly, horsefly |
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| cleistocarp | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistothecium |
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| cleistogamy | (noun) the production of small nonopening self-pollinating flowers | - |
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| cleistothecium | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistocarp |
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| clematis | (noun) any of various ornamental climbing plants of the genus Clematis usually having showy flowers | - |
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| clemency | (noun) leniency and compassion shown toward offenders by a person or agency charged with administering justice | Synonyms: mercifulness, mercy |
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| (noun) good weather with comfortable temperatures | Synonyms: mildness |
| clementine | (noun) a mandarin orange of a deep reddish orange color and few seeds | - |
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| (noun) a variety of mandarin orange that is grown around the Mediterranean and in South Africa | Synonyms: clementine tree |
| clench | (noun) the act of grasping | Synonyms: clasp, clutch, clutches, grasp, grip, hold |
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| (noun) a small slip noose made with seizing | Synonyms: clinch |
| cleome | (noun) any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers | Synonyms: spiderflower |
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| clepsydra | (noun) clock that measures time by the escape of water | Synonyms: water clock, water glass |
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| clerestory | (noun) part of an interior wall rising above the adjacent roof with windows admitting light | Synonyms: clearstory |
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| clergy | (noun) in Christianity, clergymen collectively (as distinguished from the laity) | - |
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| clergyman | (noun) a member of the clergy and a spiritual leader of the Christian Church | Synonyms: man of the cloth, reverend |
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| cleric | (noun) a clergyman or other person in religious orders | Synonyms: churchman, divine, ecclesiastic |
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| clericalism | (noun) a policy of supporting the influence and power of the clergy in secular or political matters | - |
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| clericalist | (noun) one who advocates clericalism | - |
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| clericalization | (noun) The process of increasing the power or influence of a religious hierarchy. | - |
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| clerid | (noun) predacious on other insects; usually brightly colored or metallic | Synonyms: clerid beetle |
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| clerihew | (noun) a witty satiric verse containing two rhymed couplets and mentioning a famous person | - |
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| clerisy | (noun) an educated and intellectual elite | Synonyms: intelligentsia |
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| clerk | (noun) an employee who performs clerical work (e.g., keeps records or accounts) | - |
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| (noun) a salesperson in a store | Synonyms: salesclerk, shop assistant, shop clerk |
| clerking | (noun) the activity of recording business transactions | Synonyms: bookkeeping |
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| clerkship | (noun) the job of clerk | - |
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| cleverness | (noun) the property of being ingenious | Synonyms: ingeniousness, ingenuity |
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| (noun) intelligence as manifested in being quick and witty | Synonyms: brightness, smartness |
| (noun) the power of creative imagination | Synonyms: ingeniousness, ingenuity, inventiveness |
| clevis | (noun) a coupler shaped like the letter U with holes through each end so a bolt or pin can pass through the holes to complete the coupling; used to attach a drawbar to a plow or wagon or trailer etc. | - |
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| clew | (noun) evidence that helps to solve a problem | Synonyms: clue, cue |
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| (noun) a ball of yarn or cord or thread | - |
| clews | (noun) the cords used to suspend a hammock | - |
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| conventicle | (noun) a building for religious assembly (especially Nonconformists, e.g., Quakers) | Synonyms: meetinghouse |
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| (noun) a secret unauthorized meeting for religious worship | - |
| coracle | (noun) a small rounded boat made of hides stretched over a wicker frame; still used in some parts of Great Britain | - |
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| corpuscle | (noun) either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets | Synonyms: blood cell, blood corpuscle |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: atom, molecule, mote, particle, speck |
| crepuscle | (noun) the time of day immediately following sunset | Synonyms: crepuscule, dusk, evenfall, fall, gloam, gloaming, nightfall, twilight |
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| cubicle | (noun) small area set off by walls for special use | Synonyms: booth, kiosk, stall |
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| (noun) small individual study area in a library | Synonyms: carrel, carrell, stall |
| (noun) small room in which a monk or nun lives | Synonyms: cell |
| cuticle | (noun) hard outer covering or case of certain organisms such as arthropods and turtles | Synonyms: carapace, shell, shield |
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| (noun) the outer layer of the skin covering the exterior body surface of vertebrates | Synonyms: epidermis |
| (noun) the dead skin at the base of a fingernail or toenail | - |
| cycle | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bicycle, bike, wheel |
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| (noun) a single complete execution of a periodically repeated phenomenon | Synonyms: oscillation |
| (noun) a periodically repeated sequence of events | - |
| (noun) a series of poems or songs on the same theme | - |
| (noun) an interval during which a recurring sequence of events occurs | Synonyms: rhythm, round |
| (noun) the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz) | Synonyms: cps, cycle per second, cycles/second, hertz, Hz |
| debacle | (noun) a sound defeat | Synonyms: drubbing, slaughter, thrashing, trouncing, walloping, whipping |
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| (noun) a sudden and violent collapse | Synonyms: fiasco |
| (noun) flooding caused by a tumultuous breakup of ice in a river during the spring or summer | - |
| declension | (noun) a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms | - |
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| (noun) a downward slope or bend | Synonyms: declination, decline, declivity, descent, downslope, fall |
| (noun) process of changing to an inferior state | Synonyms: decline in quality, deterioration, worsening |
| (noun) the inflection of nouns and pronouns and adjectives in Indo-European languages | - |
| denticle | (noun) small pointed ridge on the exoskeleton of an arthropod | - |
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| deoxynucleotide | (noun) Any nucleotide that contains a deoxy sugar. | - |
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| dermatosclerosis | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: scleroderma |
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| ecclesiastic | (noun) a clergyman or other person in religious orders | Synonyms: churchman, cleric, divine |
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| ecclesiasticism | (noun) excessive adherence to ecclesiastical forms and activities | - |
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| (noun) religion appropriate to a church and to ecclesiastical principles and practices | - |
| ecclesiology | (noun) the branch of theology concerned with the nature and the constitution and the functions of a church | - |
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| eclectic | (noun) someone who selects according to the eclectic method | Synonyms: eclecticist |
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| eclecticism | (noun) making decisions on the basis of what seems best instead of following some single doctrine or style | Synonyms: eclectic method |
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| eclecticist | (noun) someone who selects according to the eclectic method | Synonyms: eclectic |
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| encirclement | (noun) a war measure that isolates some area of importance to the enemy | Synonyms: blockade |
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| endonuclease | (noun) a nuclease that cleaves nucleic acids at interior bonds and so produces fragments of various sizes | - |
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| enucleation | (noun) surgical removal of something without cutting into it | - |
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| epicycle | (noun) a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid | - |
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| episcleritis | (noun) inflammation of the sclera of the eye | - |
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| exercycle | (noun) an exercise device resembling a stationary bike | Synonyms: exercise bike |
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| exonuclease | (noun) a nuclease that releases one nucleotide at a time (serially) beginning at one of a nucleic acid | - |
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