| chlamydia | (noun) coccoid rickettsia infesting birds and mammals; cause infections of eyes and lungs and genitourinary tract | - |
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| (noun) a sexually transmitted infection caused by bacteria of the genus Chlamydia | - |
| chlamydospore | (noun) thick-walled asexual resting spore of certain fungi and algae | - |
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| chlamyphore | (noun) very small Argentine armadillo with pale silky hair and pink plates on head and neck | Synonyms: Chlamyphorus truncatus, fairy armadillo, pichiciago, pichiciego |
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| chlamys | (noun) a short mantle or cape fastened at the shoulder; worn by men in ancient Greece | - |
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| (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: floral envelope, perianth, perigone, perigonium |
| chloasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: mask of pregnancy, melasma |
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| chlorambucil | (noun) an alkylating agent (trade name Leukeran) used to treat some kinds of cancer | Synonyms: Leukeran |
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| chloramine | (noun) any of several compounds containing chlorine and nitrogen; used as an antiseptic in wounds | Synonyms: chloramine-T |
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| chloramphenicol | (noun) an oral antibiotic (trade name Chloromycetin) used to treat serious infections (especially typhoid fever) | Synonyms: Chloromycetin |
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| chlorate | (noun) any salt of chloric acid | - |
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| chlordiazepoxide | (noun) a tranquilizer (trade names Librium and Libritabs) used in the treatment of alcoholism | Synonyms: Libritabs, Librium |
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| chlorella | (noun) any alga of the genus Chlorella | - |
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| chlorenchyma | (noun) parenchyma whose cells contain chloroplasts | - |
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| chlorhexidine | (noun) a long-lasting liquid antiseptic; used by surgeons to wash their hands before performing surgery | - |
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| chloride | (noun) any compound containing a chlorine atom | - |
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| (noun) any salt of hydrochloric acid (containing the chloride ion) | - |
| chlorination | (noun) disinfection of water by the addition of small amounts of chlorine or a chlorine compound | - |
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| (noun) the addition or substitution of chlorine in organic compounds | - |
| chlorine | (noun) a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water) | Synonyms: atomic number 17, Cl |
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| chlorinity | (noun) a measure of the quantity of chlorine or other halides in water (especially seawater) | - |
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| chlorite | (noun) a generally green or black mineral; it occurs as a constituent of many rocks typically in the form of a flat crystal | - |
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| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| chlorobenzene | (noun) a colorless volatile flammable liquid with an almond odor that is made from chlorine and benzene; used as a solvent and in the production of phenol and DDT and other organic compounds | - |
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| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| chloroform | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: trichloromethane |
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| chlorofucin | (noun) the chlorophyll present in brown algae, diatoms, and flagellates | Synonyms: chlorophyll c |
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| chlorophyl | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyll |
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| chlorophyll | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyl |
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| chlorophyte | (noun) algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water | Synonyms: green algae |
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| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| chloroplast | (noun) plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis | - |
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| chloroplatinate | (noun) any salt of chloroplatinic acid. | - |
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| chloroprene | (noun) derivative of butadiene used in making neoprene by polymerization | - |
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| chloroquine | (noun) an antimalarial drug used to treat malaria and amebic dysentery and systemic lupus erythematosus | - |
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| chlorosis | (noun) iron deficiency anemia in young women; characterized by weakness and menstrual disturbances and a green color to the skin | Synonyms: greensickness |
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| chlorothiazide | (noun) a diuretic drug (trade name Diuril) used in the treatment of edema and hypertension | Synonyms: Diuril |
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| chlorpromazine | (noun) a drug (trade name Thorazine) derived from phenothiazine that has antipsychotic effects and is used as a sedative and tranquilizer | Synonyms: Thorazine |
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| chlorpyrifos | (noun) a common organophosphate insecticide | - |
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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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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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