| abocclusion | (noun) the condition in which the upper teeth do not touch the lower teeth when biting | - |
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| acclaim | (noun) enthusiastic approval | Synonyms: acclamation, eclat, plaudit, plaudits |
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| (verb) praise vociferously | Synonyms: hail, herald |
| (verb) clap one's hands or shout after performances to indicate approval | Synonyms: applaud, clap, spat |
| acclamation | (noun) enthusiastic approval | Synonyms: acclaim, eclat, plaudit, plaudits |
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| acclimate | (verb) get used to a certain climate | Synonyms: acclimatise, acclimatize |
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| acclimation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimatisation, acclimatization |
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| acclimatisation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatization |
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| acclimatise | (verb) get used to a certain climate | Synonyms: acclimate, acclimatize |
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| acclimatization | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatisation |
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| acclimatize | (verb) get used to a certain climate | Synonyms: acclimate, acclimatise |
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| acclivitous | (adjective) sloping upward | Synonyms: rising, uphill |
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| acclivity | (noun) an upward slope or grade (as in a road) | Synonyms: ascent, climb, raise, rise, upgrade |
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| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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| anaclinal | (adjective) of valleys and rivers; progressing in a direction opposite to the dip in surrounding rock strata | - |
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| anaclisis | (noun) (psychoanalysis) relationship marked by strong dependence on others; especially a libidinal attachment to e.g. a parental figure | - |
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| anaclitic | (adjective) of or related to relationships that are characterized by the strong dependence of one person on another | - |
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| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| anticlimactic | (adjective) coming after the climax especially of a dramatic or narrative plot | - |
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| (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactical |
| anticlimactical | (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactic |
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| anticlimax | (noun) a change from a serious subject to a disappointing one | Synonyms: bathos |
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| (noun) a disappointing decline after a previous rise | - |
| anticlinal | (adjective) sloping downward away from a common crest | - |
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| anticlockwise | (adjective) in the direction opposite to the rotation of the hands of a clock | Synonyms: contraclockwise, counterclockwise |
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| (adverb) in a direction opposite to the direction in which the hands of a clock move | Synonyms: counterclockwise |
| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| anticyclonic | (adjective) of or relating to or characteristic of the atmosphere around a high pressure center | - |
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| 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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| arteriosclerotic | (adjective) affected by arteriosclerosis | - |
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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 |
| (verb) bind by a contract; especially for a training period | - |
| articled | (adjective) bound by contract | Synonyms: apprenticed, bound, indentured |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| asynclitism | (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: obliquity |
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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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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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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 |
| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| (verb) subject to the action of an autoclave | - |
| backcloth | (noun) scenery hung at back of stage | Synonyms: backdrop, background |
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| balaclava | (noun) a cap that is close-fitting and woolen and covers all of the head but the face | Synonyms: balaclava helmet |
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| 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 |
| becloud | (verb) make less visible or unclear | Synonyms: befog, cloud, fog, haze over, mist, obnubilate, obscure |
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| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| bespectacled | (adjective) wearing, or having the face adorned with, eyeglasses or an eyeglass | Synonyms: monocled, spectacled |
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| bicycle | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bike, cycle, wheel |
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| (verb) ride a bicycle | Synonyms: bike, cycle, pedal, wheel |
| bicycler | (noun) a person who rides a bicycle | Synonyms: bicyclist, biker, cyclist, wheeler |
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| bicyclic | (adjective) having molecules consisting of two fused rings | - |
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| bicycling | (noun) riding a bicycle | - |
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| bicyclist | (noun) a person who rides a bicycle | Synonyms: bicycler, 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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| binuclear | (adjective) having two nuclei | Synonyms: binucleate, binucleated |
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| binucleate | (adjective) having two nuclei | Synonyms: binuclear, binucleated |
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| binucleated | (adjective) having two nuclei | Synonyms: binuclear, binucleate |
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| bioclimatic | (adjective) of or concerned with the relations of climate and living organisms | - |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| bookcloth | (noun) a woven fabric (usually cotton) used for book covers. | Synonyms: book cloth |
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| bookclub | (noun) a club that people join in order to buy selected books at reduced prices | - |
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| boucle | (noun) a fabric of uneven yarn that has an uneven knobby effect | - |
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| breechcloth | (noun) a garment that provides covering for the loins | Synonyms: breechclout, loincloth |
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| breechclout | (noun) a garment that provides covering for the loins | Synonyms: breechcloth, loincloth |
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| broadcloth | (noun) a closely woven silk or synthetic fabric with a narrow crosswise rib | - |
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| (noun) a densely textured woolen fabric with a lustrous finish | - |
| 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 |
| calycled | (adjective) having a calyculus | Synonyms: calyculate |
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| canticle | (noun) a hymn derived from the Bible | - |
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| carbocyclic | (adjective) having or relating to or characterized by a ring composed of carbon atoms | - |
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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 | - |
| carbuncled | (adjective) set with carbuncles | - |
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| (adjective) afflicted with or resembling a carbuncle | Synonyms: carbuncular |
| 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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| cataclinal | (adjective) of valleys and rivers; running in the direction of the dip in surrounding rock strata | - |
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| cataclysm | (noun) an event resulting in great loss and misfortune | Synonyms: calamity, catastrophe, disaster, tragedy |
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| (noun) a sudden violent change in the earth's surface | Synonyms: catastrophe |
| cataclysmal | (adjective) severely destructive | Synonyms: cataclysmic |
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| cataclysmic | (adjective) severely destructive | Synonyms: cataclysmal |
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| catclaw | (noun) erect shrub with small if any spines having racemes of white to yellow flowers followed by curved pointed pods and black shiny seeds; West Indies and Florida | Synonyms: black bead, cat's-claw, Pithecellobium unguis-cati |
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| cerecloth | (noun) a waterproof waxed cloth once used as a shroud | - |
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| cheesecloth | (noun) a coarse loosely woven cotton gauze; originally used to wrap cheeses | - |
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| chicle | (noun) gum-like substance from the sapodilla | Synonyms: chicle gum |
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| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| 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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| 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 | - |
| (verb) form or draw a circle around | Synonyms: encircle |
| (verb) move in a circular path above (someone or something) | - |
| (verb) travel around something | - |
| circlet | (noun) decorated metal band worn around the head | - |
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| (noun) a small circle | - |
| cl | (adjective) being ten more than one hundred forty | Synonyms: 150, one hundred fifty |
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| (noun) a metric unit of volume equal to one hundredth of a liter | Synonyms: centiliter, centilitre |
| clabber | (noun) raw milk that has soured and thickened | - |
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| (verb) turn into curds | Synonyms: clot, curdle |
| clack | (noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction | Synonyms: clack valve, clapper valve |
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| (noun) a sharp abrupt noise as if two objects hit together; may be repeated | Synonyms: clap |
| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, blabber, chatter, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
| (verb) make a clucking sounds, characteristic of hens | Synonyms: click, cluck |
| (verb) make a rattling sound | Synonyms: brattle, clatter |
| clad | (adjective) wearing or provided with clothing; sometimes used in combination | Synonyms: clothed |
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| (adjective) having an outer covering especially of thin metal | - |
| cladding | (noun) a protective covering that protects the outside of a building | Synonyms: facing |
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| clade | (noun) a group of biological taxa or species that share features inherited from a common ancestor | - |
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| cladistics | (noun) a taxonomic system of classifying species based on the branching patterns of cladograms that are built to infer phylogenetic relations | Synonyms: cladistic analysis |
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| cladode | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladophyll, phylloclad, phylloclade |
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| cladogram | (noun) a tree diagram used to illustrate phylogenetic relationships | - |
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| cladophyll | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, phylloclad, phylloclade |
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| claim | (noun) demand for something as rightful or due | - |
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| (noun) an established or recognized right | Synonyms: title |
| (noun) an informal right to something | Synonyms: title |
| (noun) an assertion of a right (as to money or property) | - |
| (noun) a demand | Synonyms: call |
| (noun) an assertion that something is true or factual | - |
| (verb) assert or affirm strongly; state to be true or existing | - |
| (verb) take as an undesirable consequence of some event or state of affairs | Synonyms: exact, take |
| (verb) ask for legally or make a legal claim to, as of debts, for example | - |
| (verb) lay claim to; as of an idea | Synonyms: take |
| (verb) demand as being one's due or property; assert one's right or title to | Synonyms: arrogate, lay claim |
| claimant | (noun) someone who claims a benefit or right or title | - |
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| clairvoyance | (noun) apparent power to perceive things that are not present to the senses | Synonyms: E.S.P., ESP, extrasensory perception, second sight |
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| clairvoyant | (adjective) perceiving things beyond the natural range of the senses | - |
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| (adjective) foreseeing the future | Synonyms: precognitive, second-sighted |
| (noun) someone who has the power of clairvoyance | - |
| clam | (noun) burrowing marine mollusk living on sand or mud; the shell closes with viselike firmness | - |
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| (noun) flesh of either hard-shell or soft-shell clams | - |
| (noun) a piece of paper money worth one dollar | Synonyms: buck, dollar, dollar bill, one dollar bill |
| (verb) gather clams, by digging in the sand by the ocean | - |
| clamant | (adjective) demanding attention | Synonyms: crying, exigent, insistent, instant |
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| (adjective) conspicuously and offensively loud; given to vehement outcry | Synonyms: blatant, clamorous, strident, vociferous |
| clamatorial | (adjective) of or relating to Clamatores | - |
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| clambake | (noun) a cookout at the seashore where clams and fish and other foods are cooked--usually on heated stones covered with seaweed | - |
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| clamber | (noun) an awkward climb | - |
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| (verb) climb awkwardly, as if by scrambling | Synonyms: scramble, shin, shinny, skin, sputter, struggle |