| bone | (noun) a shade of white the color of bleached bones | Synonyms: ivory, off-white, pearl |
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| (noun) rigid connective tissue that makes up the skeleton of vertebrates | Synonyms: os |
| (noun) the porous calcified substance from which bones are made | Synonyms: osseous tissue |
| borderline | (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
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| bourne | (noun) an archaic term for a goal or destination | Synonyms: bourn |
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| (noun) an archaic term for a boundary | Synonyms: bourn |
| bovine | (noun) any of various members of the genus Bos | - |
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| bowline | (noun) a loop knot that neither slips nor jams | Synonyms: bowline knot |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| breadline | (noun) a queue of people waiting for free food | Synonyms: bread line |
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| breakstone | (noun) any of various plants of the genus Saxifraga | Synonyms: rockfoil, saxifrage |
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| breastbone | (noun) the flat bone that articulates with the clavicles and the first seven pairs of ribs | Synonyms: sternum |
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| brigandine | (noun) a medieval coat of chain mail consisting of metal rings sewn onto leather or cloth | - |
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| brigantine | (noun) two-masted sailing vessel square-rigged on the foremast and fore-and-aft rigged on the mainmast | Synonyms: hermaphrodite brig |
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| brilliantine | (noun) a pomade to make the hair manageable and lustrous | - |
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| brimstone | (noun) an old name for sulfur | Synonyms: native sulfur, native sulphur |
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| brine | (noun) a strong solution of salt and water used for pickling | - |
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| (noun) water containing salts | Synonyms: saltwater, seawater |
| bromine | (noun) a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water | Synonyms: atomic number 35, Br |
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| brownstone | (noun) a row house built of brownstone; reddish brown in color | - |
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| (noun) a reddish brown sandstone; used in buildings | - |
| brucine | (noun) a bitter alkaloid poison resembling strychnine and extracted from nux vomica | - |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| bugbane | (noun) a plant of the genus Cimicifuga having flowers in long racemes or panicles reported to be distasteful to insects | - |
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| (noun) North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally | Synonyms: American hellebore, Indian poke, Veratrum viride, white hellebore |
| buspirone | (noun) a drug (trade name BuSpar) designed specifically for anxiety | Synonyms: BuSpar |
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| butacaine | (noun) a white crystalline ester that is applied to mucous membranes as a local anesthetic | Synonyms: butacaine sulfate |
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| butadiene | (noun) a gaseous hydrocarbon C4H6; used in making synthetic rubbers | - |
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| butane | (noun) occurs in natural gas; used in the manufacture of rubber and fuels | - |
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| butanone | (noun) colorless soluble flammable liquid ketone used as a solvent for resins and as a paint remover and in lacquers and cements and adhesives and cleaning fluids and celluloid | Synonyms: methyl ethyl ketone |
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| butene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butylene |
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| buteonine | (noun) any hawk of the genus Buteo | - |
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| butylene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butene |
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| bygone | (noun) past events to be put aside | Synonyms: water under the bridge |
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| cadaverine | (noun) a colorless toxic ptomaine with an unpleasant odor formed during the putrefaction of animal tissue | - |
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| caffeine | (noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects | Synonyms: caffein |
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| calamine | (noun) a white mineral; a common ore of zinc | Synonyms: hemimorphite |
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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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| canavanine | (noun) an amino acid found in the jack bean | - |
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| cane | (noun) a stiff switch, used to hit (usually students) as punishment | - |
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| (noun) a stick that people can lean on to help them walk | - |
| (noun) a strong slender often flexible stem as of bamboos, reeds, rattans, or sugar cane | - |
| canine | (noun) any of various fissiped mammals with nonretractile claws and typically long muzzles | Synonyms: canid |
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| (noun) one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars | Synonyms: canine tooth, cuspid, dogtooth, eye tooth, eyetooth |
| capstone | (noun) a stone that forms the top of wall or building | Synonyms: copestone, coping stone, stretcher |
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| (noun) a final touch; a crowning achievement; a culmination | Synonyms: copestone, finishing touch |
| carbine | (noun) light automatic rifle | - |
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| carmine | (noun) a variable color averaging a vivid red | Synonyms: cardinal |
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| carotene | (noun) an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver | Synonyms: carotin, provitamin A |
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| (noun) yellow or orange-red fat-soluble pigments in plants | - |
| catarrhine | (noun) of Africa or Arabia or Asia; having nonprehensile tails and nostrils close together | Synonyms: Old World monkey |
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| catecholamine | (noun) any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland | - |
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| cayenne | (noun) ground pods and seeds of pungent red peppers of the genus Capsicum | Synonyms: cayenne pepper, red pepper |
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| (noun) a long and often twisted hot red pepper | Synonyms: cayenne pepper |
| (noun) plant bearing very hot and finely tapering long peppers; usually red | Synonyms: Capsicum annuum longum, cayenne pepper, chili pepper, chilli pepper, jalapeno, long pepper |
| cefoperazone | (noun) a parenteral cephalosporin (trade name Cefobid) used for severe infections | Synonyms: Cefobid |
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| ceftriaxone | (noun) a parenteral cephalosporin (trade name Rocephin) used for severe infection of the lungs or throat or ears or urinary tract | Synonyms: Rocephin |
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| celandine | (noun) perennial herb with branched woody stock and bright yellow flowers | Synonyms: Chelidonium majus, greater celandine, swallow wort, swallowwort |
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| (noun) North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil | Synonyms: Impatiens capensis, jewelweed, lady's earrings, orange balsam, touch-me-not |
| cellophane | (noun) a transparent paperlike product that is impervious to moisture and used to wrap candy or cigarettes etc. | - |
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| cellphone | (noun) a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver | Synonyms: cell, cellular phone, cellular telephone, mobile phone |
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| centerline | (noun) a line that bisects a plane figure | Synonyms: center line |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| chalkstone | (noun) a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout | Synonyms: tophus |
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| champagne | (noun) a white sparkling wine either produced in Champagne or resembling that produced there | Synonyms: bubbly |
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| chaperone | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperon |
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| chatelaine | (noun) a chain formerly worn at the waist by women; for carrying a purse or bunch of keys etc. | - |
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| (noun) the mistress of a chateau or large country house | - |
| cheekbone | (noun) the arch of bone beneath the eye that forms the prominence of the cheek | Synonyms: jugal bone, malar, malar bone, os zygomaticum, zygomatic, zygomatic bone |
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| cherrystone | (noun) a half-grown quahog | Synonyms: cherrystone clam |
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| (noun) small quahog larger than a littleneck; eaten raw or cooked as in e.g. clams casino | Synonyms: cherrystone clam |
| chicane | (noun) the use of tricks to deceive someone (usually to extract money from them) | Synonyms: chicanery, guile, shenanigan, trickery, wile |
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| (noun) a movable barrier used in motor racing; sometimes placed before a dangerous corner to reduce speed as cars pass in single file | - |
| (noun) a bridge hand that is void of trumps | - |
| chine | (noun) backbone of an animal | - |
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| (noun) cut of meat or fish including at least part of the backbone | - |
| chloramine | (noun) any of several compounds containing chlorine and nitrogen; used as an antiseptic in wounds | Synonyms: chloramine-T |
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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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| 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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| 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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| 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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| 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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| 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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| choline | (noun) a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat | - |
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| chopine | (noun) a woman's shoe with a very high thick sole | Synonyms: platform |
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| chordophone | (noun) a stringed instrument of the group including harps, lutes, lyres, and zithers | - |
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| chorine | (noun) a woman who dances in a chorus line | Synonyms: chorus girl, showgirl |
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| cicerone | (noun) a guide who conducts and informs sightseers | - |
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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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| cinchonine | (noun) an alkaloid derivative of the bark of cinchona trees that is used as an antimalarial drug | - |
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| cinnamene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: phenylethylene, styrene, vinylbenzene |
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| citrine | (noun) semiprecious yellow quartz resembling topaz | - |
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| citrulline | (noun) an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine | - |
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| claystone | (noun) fine-grained rock consisting of compacted clay particles | - |
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| 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 |
| clingstone | (noun) fruit (especially peach) whose flesh adheres strongly to the pit | Synonyms: cling |
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| cloisonne | (noun) enamelware in which colored areas are separated by thin metal strips | - |
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| clomiphene | (noun) a fertility drug (trade name Clomid) that is used to stimulate ovulation and that has been associated with multiple births | Synonyms: Clomid, clomiphene citrate |
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| clomipramine | (noun) a tricyclic antidepressant drug | - |
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| clone | (noun) an unauthorized copy or imitation | Synonyms: knockoff |
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| (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clon |
| (noun) a person who is almost identical to another | Synonyms: dead ringer, ringer |
| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| clothesline | (noun) a cord on which clothes are hung to dry | - |
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| clozapine | (noun) an antipsychotic drug (trade name Clozaril) used as a sedative and for treatment-resistant schizophrenia; known to have few side effects | Synonyms: Clozaril |
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| coastline | (noun) the outline of a coast | - |
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| cobblestone | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobble, sett |
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| cocaine | (noun) a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive | Synonyms: cocain |
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| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| coelogyne | (noun) any of various orchids of the genus Coelogyne with: clusters of fragrant lacy snow-white flowers; salmon-pink solitary flowers; chainlike racemes of topaz and chocolate brown flowers; spikes of delicate white spice-scented flowers; emerald green flowers marked with blue-black | - |
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| cohune | (noun) tropical American feather palm whose large nuts yield valuable oil and a kind of vegetable ivory | Synonyms: cohune palm, Orbignya cohune |
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| coigne | (noun) the keystone of an arch | Synonyms: coign, quoin |
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| (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase | Synonyms: coign, quoin |
| colchicine | (noun) an analgesic drug derived from the saffron plant and used to treat gout | - |
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| collarbone | (noun) bone linking the scapula and sternum | Synonyms: clavicle |
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| cologne | (noun) a perfumed liquid made of essential oils and alcohol | Synonyms: cologne water, eau de cologne |
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| columbine | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, aquilegia |
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| combine | (noun) harvester that heads and threshes and cleans grain while moving across the field | - |
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| (noun) an occurrence that results in things being united | Synonyms: combining |
| (noun) a consortium of independent organizations formed to limit competition by controlling the production and distribution of a product or service | Synonyms: cartel, corporate trust, trust |
| comedienne | (noun) a female comedian | - |
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| (noun) a female actor in a comedy | - |