| chromatid | (noun) one of two identical strands into which a chromosome splits during mitosis | - |
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| chrysomelid | (noun) brightly colored beetle that feeds on plant leaves; larvae infest roots and stems | Synonyms: leaf beetle |
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| chrysopid | (noun) pale green unpleasant-smelling lacewing fly having carnivorous larvae | Synonyms: green lacewing, stink fly |
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| churidars | (noun) tight trousers worn by people from the Indian subcontinent (typically with a kameez or kurta) | - |
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| cichlid | (noun) freshwater fishes of tropical America and Africa and Asia similar to American sunfishes; some are food fishes; many small ones are popular in aquariums | Synonyms: cichlid fish |
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| cider | (noun) a beverage made from juice pressed from apples | Synonyms: cyder |
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| ciderpress | (noun) a press that is used to extract the juice from apples | - |
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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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| clerid | (noun) predacious on other insects; usually brightly colored or metallic | Synonyms: clerid beetle |
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| clinid | (noun) mostly small blennioid fishes of coral reefs and seagrass beds | Synonyms: clinid fish |
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| clitoridectomy | (noun) excision of the clitoris | Synonyms: female circumcision |
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| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| clupeid | (noun) any of numerous soft-finned schooling food fishes of shallow waters of northern seas | Synonyms: clupeid fish |
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| cnidarian | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: coelenterate |
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| coccidioidomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidiomycosis, desert rheumatism, valley fever |
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| coccidiomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidioidomycosis, desert rheumatism, valley fever |
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| coccidiosis | (noun) (veterinary medicine) infestation with coccidia | - |
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| coccidium | (noun) parasitic on the digestive epithelium of vertebrates and higher invertebrates | Synonyms: eimeria |
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| coincidence | (noun) the temporal property of two things happening at the same time | Synonyms: co-occurrence, concurrence, conjunction |
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| (noun) the quality of occupying the same position or area in space | - |
| (noun) an event that might have been arranged although it was really accidental | Synonyms: happenstance |
| collider | (noun) an accelerator in which two beams of particles are forced to collide head on | - |
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| colloid | (noun) a mixture with properties between those of a solution and fine suspension | - |
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| colubrid | (noun) mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes | Synonyms: colubrid snake |
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| comatulid | (noun) free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms | Synonyms: feather star |
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| conchoid | (noun) Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts). | - |
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| confidant | (noun) someone to whom private matters are confided | Synonyms: intimate |
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| confidante | (noun) a female confidant | - |
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| confidence | (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, authority, self-assurance, self-confidence, sureness |
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| (noun) a secret that is confided or entrusted to another | - |
| (noun) a feeling of trust (in someone or something) | - |
| (noun) a state of confident hopefulness that events will be favorable | - |
| (noun) a trustful relationship | Synonyms: trust |
| confidentiality | (noun) discretion in keeping secret information | - |
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| (noun) the state of being secret | - |
| conidiophore | (noun) a specialized fungal hypha that produces conidia | - |
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| conidiospore | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidium |
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| conidium | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidiospore |
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| conoid | (noun) a shape whose base is a circle and whose sides taper up to a point | Synonyms: cone, cone shape |
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| considerateness | (noun) kind and considerate regard for others | Synonyms: consideration, thoughtfulness |
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| consideration | (noun) a considerate and thoughtful act | Synonyms: thoughtfulness |
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| (noun) kind and considerate regard for others | Synonyms: considerateness, thoughtfulness |
| (noun) the process of giving careful thought to something | - |
| (noun) information that should be kept in mind when making a decision | Synonyms: circumstance, condition |
| (noun) a discussion of a topic (as in a meeting) | - |
| (noun) a fee charged in advance to retain the services of someone | Synonyms: retainer |
| consolidation | (noun) the act of combining into an integral whole | Synonyms: integration |
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| (noun) combining into a solid mass | - |
| (noun) something that has consolidated into a compact mass | - |
| coreid | (noun) a true bug | Synonyms: coreid bug |
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| corrida | (noun) a Spanish or Portuguese or Latin American spectacle; a matador baits and (usually) kills a bull in an arena before many spectators | Synonyms: bullfight |
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| corridor | (noun) an enclosed passageway; rooms usually open onto it | - |
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| corticoid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticosteroid |
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| corticosteroid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticoid |
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| cosmid | (noun) (genetics) a large vector that is made from a bacteriophage and used to clone genes or gene fragments | - |
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| counterevidence | (noun) (philosophy, law, sciences) Evidence which tends to disprove a claim or hypothesis. | Synonyms: counter-evidence |
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| countryside | (noun) rural regions | - |
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| cowhide | (noun) a heavy flexible whip braided from leather made from the hide of a cow | - |
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| (noun) leather made from the hide of a cow | Synonyms: cowskin |
| (noun) the hide of a cow | - |
| crinoid | (noun) primitive echinoderms having five or more feathery arms radiating from a central disk | - |
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| cryptorchidism | (noun) failure of one or both testes to move into the scrotum as the male fetus develops | Synonyms: cryptorchidy, cryptorchism |
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| cryptorchidy | (noun) failure of one or both testes to move into the scrotum as the male fetus develops | Synonyms: cryptorchidism, cryptorchism |
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| ctenidium | (noun) comb-like respiratory structure serving as the gill of certain mollusks | - |
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| cuboid | (noun) a rectangular parallelepiped | - |
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| cupid | (noun) a symbol for love in the form of a cherubic naked boy with wings and a bow and arrow | - |
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| cupidity | (noun) extreme greed for material wealth | Synonyms: avarice, avariciousness, covetousness |
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| curbside | (noun) the side of a sidewalk that is bordered by a curb | - |
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| cuspid | (noun) one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars | Synonyms: canine, canine tooth, dogtooth, eye tooth, eyetooth |
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| cuspidation | (noun) a decoration using cusps | - |
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| cuspidor | (noun) a receptacle for spit (usually in a public place) | Synonyms: spittoon |
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| cyanamid | (noun) a weak soluble dibasic acid (the parent acid of cyanamide salts) | Synonyms: cyanamide |
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| cyanamide | (noun) a weak soluble dibasic acid (the parent acid of cyanamide salts) | Synonyms: cyanamid |
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| (noun) a compound used as a fertilizer and as a source of nitrogen compounds | Synonyms: calcium-cyanamide |
| cyanide | (noun) an extremely poisonous salt of hydrocyanic acid | - |
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| (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: nitril, nitrile |
| cyanuramide | (noun) a white crystalline organic base; used mainly in making melamine resins | Synonyms: melamine |
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| cycloid | (noun) a line generated by a point on a circle rolling along a straight line | - |
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| cymbid | (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers | Synonyms: cymbidium |
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| cymbidium | (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers | Synonyms: cymbid |
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| cyprinid | (noun) soft-finned mainly freshwater fishes typically having toothless jaws and cycloid scales | Synonyms: cyprinid fish |
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| cytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: deoxycytidine |
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| dairymaid | (noun) a woman who works in a dairy | Synonyms: milkmaid |
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| daminozide | (noun) a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time | Synonyms: Alar |
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| danaid | (noun) large tropical butterfly with degenerate forelegs and an unpleasant taste | Synonyms: danaid butterfly |
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| dasyurid | (noun) small carnivorous nocturnal marsupials of Australia and Tasmania | Synonyms: dasyurid marsupial |
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| debridement | (noun) surgical removal of foreign material and dead tissue from a wound in order to prevent infection and promote healing | - |
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| deciding | (noun) the cognitive process of reaching a decision | Synonyms: decision making |
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| decidua | (noun) the epithelial tissue of the endometrium | - |
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| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| deltoid | (noun) a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm | Synonyms: deltoid muscle, musculus deltoideus |
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| demantoid | (noun) a green andradite used as a gemstone | - |
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| deoxycytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: cytidine |
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| deoxynucleotide | (noun) Any nucleotide that contains a deoxy sugar. | - |
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| deoxythymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: thymidine |
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| desideratum | (noun) something desired as a necessity | - |
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| desmid | (noun) freshwater green algae | - |
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| diapsid | (noun) reptile having a pair of openings in the skull behind each eye | Synonyms: diapsid reptile |
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| diazoxide | (noun) vasodilator (trade name Hyperstat) used to treat severe hypertension | Synonyms: Hyperstat |
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| dicamptodontid | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodon |
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| dichloride | (noun) a compound containing two chlorine atoms per molecule | Synonyms: bichloride |
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| didacticism | (noun) communication that is suitable for or intended to be instructive | - |
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| didactics | (noun) the activities of educating or instructing; activities that impart knowledge or skill | Synonyms: education, educational activity, instruction, pedagogy, teaching |
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| didanosine | (noun) an antiviral drug used to combat HIV infection, a reverse transcriptase inhibitor | Synonyms: ddI, DDI, dideoxyinosine |
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| diddley | (noun) a small worthless amount | Synonyms: diddly-shit, diddly-squat, diddly, diddlyshit, diddlysquat, doodly-squat, jack, shit, squat |
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| diddly | (noun) a small worthless amount | Synonyms: diddley, diddly-shit, diddly-squat, diddlyshit, diddlysquat, doodly-squat, jack, shit, squat |
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| diddlyshit | (noun) a small worthless amount | Synonyms: diddley, diddly-shit, diddly-squat, diddly, diddlysquat, doodly-squat, jack, shit, squat |
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| diddlysquat | (noun) a small worthless amount | Synonyms: diddley, diddly-shit, diddly-squat, diddly, diddlyshit, doodly-squat, jack, shit, squat |
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| dideoxycytosine | (noun) an antiviral drug used to combat HIV infection; a nucleoside analog reverse transcriptase inhibitor (NARTI) | Synonyms: ddC, DDC, zalcitabine |
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| dideoxyinosine | (noun) an antiviral drug used to combat HIV infection, a reverse transcriptase inhibitor | Synonyms: ddI, DDI, didanosine |
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| diffidence | (noun) lack of self-confidence | Synonyms: self-distrust, self-doubt |
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| dihybrid | (noun) a hybrid produced by parents that differ only at two gene loci that have two alleles each | - |
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| dilapidation | (noun) the process of becoming dilapidated | Synonyms: ruin |
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| (noun) a state of deterioration due to old age or long use | Synonyms: decrepitude |
| dioxide | (noun) an oxide containing two atoms of oxygen in the molecule | - |
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| diploid | (noun) (genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number | - |
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| diploidy | (noun) the condition of being diploid | - |
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