| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| autoimmune | (adjective) of or relating to the immune response of the body against substance normally present in the body | - |
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| autoimmunity | (noun) production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions | - |
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| azimuth | (noun) the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian | Synonyms: AZ |
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| azimuthal | (adjective) of or relating to or in azimuth | - |
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| azoimide | (noun) a colorless explosive liquid that is volatile and poisonous and foul-smelling | Synonyms: HN, hydrazoic acid, hydrogen azide |
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| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| bedim | (verb) make darker and difficult to perceive by sight | Synonyms: benight |
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| (verb) make unintelligible or unclear | Synonyms: obscure, overcloud |
| bedimmed | (adjective) made dim or indistinct | - |
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| bedtime | (noun) the time you go to bed | - |
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| begrime | (verb) make soiled, filthy, or dirty | Synonyms: bemire, colly, dirty, grime, soil |
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| begrimed | (adjective) thickly covered with ingrained dirt or soot | Synonyms: dingy, grimy, grubby, grungy, raunchy |
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| betimes | (adverb) in good time | Synonyms: early |
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| bilimbi | (noun) East Indian evergreen tree bearing very acid fruit | Synonyms: Averrhoa bilimbi |
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| bimanual | (adjective) requiring two hands or designed for two people | Synonyms: two-handed |
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| bimbo | (noun) a young woman indulged by rich and powerful older men | - |
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| bimester | (noun) a period of 2 months | - |
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| bimestrial | (adjective) two months long; lasting two months | - |
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| (adjective) occurring every two months | Synonyms: bimonthly |
| bimetal | (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetallic |
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| (noun) material made by bonding together sheets of two different metals | - |
| bimetallic | (adjective) pertaining to a monetary system based on two metals | Synonyms: bimetallistic |
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| (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetal |
| bimetallism | (noun) a monetary standard under which the basic unit of currency is defined by stated amounts of two metals (usually gold and silver) with values set at a predetermined ratio | - |
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| bimetallist | (noun) an advocate of bimetallism | - |
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| bimetallistic | (adjective) pertaining to a monetary system based on two metals | Synonyms: bimetallic |
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| bimillenary | (noun) a span of 2000 years | Synonyms: bimillennium |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillennium |
| bimillenial | (adjective) of or relating to a bimillennium | - |
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| bimillennium | (noun) a span of 2000 years | Synonyms: bimillenary |
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| (noun) the 2000th anniversary (or the celebration of it) | Synonyms: bimillenary |
| bimli | (noun) valuable fiber plant of East Indies now widespread in cultivation | Synonyms: bimli hemp, Bombay hemp, deccan hemp, Hibiscus cannabinus, Indian hemp, kanaf, kenaf |
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| bimodal | (adjective) of a distribution; having or occurring with two modes | - |
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| bimolecular | (adjective) relating to or affecting two molecules | - |
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| bimonthly | (adjective) occurring every two months | Synonyms: bimestrial |
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| (adjective) occurring twice a month | Synonyms: semimonthly |
| (noun) a periodical that is published twice a month or every two months (either 24 or 6 issues per year) | - |
| (adverb) every two months | - |
| (adverb) twice a month | Synonyms: semimonthly |
| bimorphemic | (adjective) consisting of two morphemes | - |
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| bimotored | (adjective) having two motors | - |
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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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| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| (verb) spread birdlime on branches to catch birds | Synonyms: lime |
| blimp | (noun) a small nonrigid airship used for observation or as a barrage balloon | Synonyms: sausage, sausage balloon |
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| blimpish | (adjective) pompously ultraconservative and nationalistic | - |
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| brim | (noun) a circular projection that sticks outward from the crown of a hat | - |
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| (noun) the top edge of a vessel or other container | Synonyms: lip, rim |
| (verb) fill as much as possible | - |
| (verb) be completely full | - |
| brimful | (adjective) filled up | Synonyms: brimfull, brimming |
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| brimfull | (adjective) filled up | Synonyms: brimful, brimming |
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| brimless | (adjective) without a brim | - |
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| brimming | (adjective) filled up | Synonyms: brimful, brimfull |
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| brimstone | (noun) an old name for sulfur | Synonyms: native sulfur, native sulphur |
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| brooklime | (noun) plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers | Synonyms: American brooklime, Veronica americana |
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| (noun) European plant having low-lying stems with blue flowers; sparsely naturalized in North America | Synonyms: European brooklime, Veronica beccabunga |
| bulimarexia | (noun) a disorder of eating in which the person alternates between strong craving for food and aversion to food; characterized by excessive eating followed by periods of fasting or self-induced vomiting | Synonyms: binge-purge syndrome, binge-vomit syndrome, bulimia nervosa |
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| bulimia | (noun) pathologically insatiable hunger (especially when caused by brain lesions) | - |
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| (noun) a disorder of eating seen among young women who go on eating binges and then feel guilt and depression and self-condemnation | Synonyms: binge-eating syndrome |
| bulimic | (adjective) suffering from bulimia | - |
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| (noun) a person suffering from bulimia | - |
| caiman | (noun) a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly | Synonyms: cayman |
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| caimitillo | (noun) tropical American timber tree with dark hard heavy wood and small plumlike purple fruit | Synonyms: Chrysophyllum oliviforme, damson plum, satin leaf, satinleaf |
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| caimito | (noun) evergreen tree of West Indies and Central America having edible purple fruit star-shaped in cross section and dark green leaves with golden silky undersides | Synonyms: Chrysophyllum cainito, star apple |
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| calcimine | (noun) a water-base paint containing zinc oxide and glue and coloring; used as a wash for walls and ceilings | - |
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| (verb) cover with calcimine | - |
| calorimeter | (noun) a measuring instrument that determines quantities of heat | - |
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| calorimetric | (adjective) of or relating to the measurement of heat | - |
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| calorimetry | (noun) measurement of quantities of heat | - |
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| caprimulgid | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: goatsucker, nightjar |
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| cefotaxime | (noun) a parenteral cephalosporin (trade name Claforan) used for severe infections of the lungs or throat or ears or urinary tract | Synonyms: Claforan |
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| ceftazidime | (noun) a parenteral cephalosporin (trade names Fortaz and Tazicef) used to treat moderate infections | Synonyms: Fortaz, Tazicef |
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| cefuroxime | (noun) a cephalosporin that can be given parenterally (trade name Zinacef) or orally by tablets (trade name Ceftin); indicated for infections of the lungs or throat or ears or urinary tract or meninges | Synonyms: Ceftin, Zinacef |
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| centesimal | (adjective) relating to or divided into hundredths | - |
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| (adjective) the ordinal number of one hundred in counting order | Synonyms: 100th, hundredth |
| centesimo | (noun) a fractional monetary unit of several countries: Panama and Italy and Uruguay and Chile | - |
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| centime | (noun) a coin worth one-hundredth of the value of the basic unit | Synonyms: cent, penny |
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| (noun) a fractional monetary unit of several countries: France and Algeria and Belgium and Burkina Faso and Burundi and Cameroon and Chad and the Congo and Gabon and Haiti and the Ivory Coast and Luxembourg and Mali and Morocco and Niger and Rwanda and Senegal and Switzerland and Togo | - |
| centimeter | (noun) a metric unit of length equal to one hundredth of a meter | Synonyms: centimetre, cm |
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| centimetre | (noun) a metric unit of length equal to one hundredth of a meter | Synonyms: centimeter, cm |
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| centimo | (noun) a fractional monetary unit of Venezuela and Costa Rica and Equatorial Guinea and Paraguay and Spain | - |
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| ceriman | (noun) tropical cylindrical fruit resembling a pinecone with pineapple-banana flavor | Synonyms: monstera |
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| (noun) tropical American vine having roots that hang like cords and cylindrical fruit with a pineapple and banana flavor | Synonyms: Monstera deliciosa |
| cetrimide | (noun) a cationic detergent that is a powerful disinfectant | - |
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| chemoimmunology | (noun) the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies) | Synonyms: immunochemistry |
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| cherimolla | (noun) large tropical fruit with leathery skin and soft pulp; related to custard apples | Synonyms: cherimoya |
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| cherimoya | (noun) large tropical fruit with leathery skin and soft pulp; related to custard apples | Synonyms: cherimolla |
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| (noun) small tropical American tree bearing round or oblong fruit | Synonyms: Annona cherimola, cherimoya tree |
| chimaera | (noun) a deep-sea fish with a tapering body, smooth skin, and long threadlike tail | - |
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| (noun) a grotesque product of the imagination | Synonyms: chimera |
| chime | (noun) a percussion instrument consisting of a set of tuned bells that are struck with a hammer; used as an orchestral instrument | Synonyms: bell, gong |
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| (verb) emit a sound | - |
| chimer | (noun) a fur-lined coat decorated with braid, worn in the sixteenth century. | Synonyms: chamarre, simarre |
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| chimera | (noun) a grotesque product of the imagination | Synonyms: chimaera |
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| chimeral | (adjective) being or relating to or like a chimera | Synonyms: chimeric, chimerical |
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| chimeric | (adjective) being or relating to or like a chimera | Synonyms: chimeral, chimerical |
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| chimerical | (adjective) being or relating to or like a chimera | Synonyms: chimeral, chimeric |
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| (adjective) produced by a wildly fanciful imagination | - |
| chimney | (noun) a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building | - |
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| (noun) a glass flue surrounding the wick of an oil lamp | Synonyms: lamp chimney |
| chimneypiece | (noun) shelf that projects from wall above fireplace | Synonyms: mantel, mantelpiece, mantle, mantlepiece |
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| chimneypot | (noun) a short earthenware pipe on the top of a chimney to increase the draft | - |
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| chimneystack | (noun) the part of the chimney that is above the roof; usually has several flues | - |
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| chimneysweep | (noun) someone who cleans soot from chimneys | Synonyms: chimneysweeper, sweep |
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| chimneysweeper | (noun) someone who cleans soot from chimneys | Synonyms: chimneysweep, sweep |
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| chimp | (noun) intelligent somewhat arboreal ape of equatorial African forests | Synonyms: chimpanzee, Pan troglodytes |
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| chimpanzee | (noun) intelligent somewhat arboreal ape of equatorial African forests | Synonyms: chimp, Pan troglodytes |
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| chittimwood | (noun) deciduous tree of southeastern United States and Mexico | Synonyms: black haw, Bumelia lanuginosa, chittamwood, false buckthorn, shittimwood |
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| (noun) shrubby tree of the Pacific coast of the United States; yields cascara sagrada | Synonyms: bearberry, bearwood, cascara buckthorn, chittamwood, Rhamnus purshianus |
| 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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| cimetidine | (noun) a drug (trade name Tagamet) used to treat peptic ulcers by decreasing the secretion of stomach acid | Synonyms: Tagamet |
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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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| climacteric | (noun) the time in a woman's life in which the menstrual cycle ends | Synonyms: change of life, menopause |
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| (noun) a period in a man's life corresponding to menopause | - |
| climactic | (adjective) consisting of or causing a climax | - |
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| climate | (noun) the weather in some location averaged over some long period of time | Synonyms: clime |
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| (noun) the prevailing psychological state | Synonyms: mood |
| climatic | (adjective) of or relating to a climate | Synonyms: climatical |
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| climatical | (adjective) of or relating to a climate | Synonyms: climatic |
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| climatically | (adverb) with respect to climate | - |
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| climatologist | (noun) someone who is expert in climatology | - |
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| climatology | (noun) meteorology of climates and their phenomena | - |
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| climax | (noun) the moment of most intense pleasure in sexual intercourse | Synonyms: coming, orgasm, sexual climax |
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| (noun) the decisive moment in a novel or play | Synonyms: culmination |
| (noun) arrangement of clauses in ascending order of forcefulness | - |
| (noun) the highest point of anything conceived of as growing or developing or unfolding | Synonyms: flood tide |
| (noun) the most severe stage of a disease | - |
| (verb) end, especially to reach a final or climactic stage | Synonyms: culminate |
| climb | (noun) the act of climbing something | Synonyms: mount |
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| (noun) an event that involves rising to a higher point (as in altitude or temperature or intensity etc.) | Synonyms: climbing, mounting |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, raise, rise, upgrade |
| (verb) go up or advance | Synonyms: mount, rise, wax |
| (verb) increase in value or to a higher point | Synonyms: go up, rise |
| (verb) improve one's social status | - |
| (verb) go upward with gradual or continuous progress | Synonyms: climb up, go up, mount |
| (verb) move with effort, by grasping | - |
| (verb) slope upward | - |
| climbable | (adjective) capable of being surmounted | Synonyms: surmountable |
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| (adjective) capable of being ascended | Synonyms: ascendable, ascendible |