| balletomane | (noun) a ballet enthusiast | - |
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| bane | (noun) something causing misery or death | Synonyms: curse, nemesis, scourge |
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| barbitone | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, diethylbarbituric acid, diethylmalonylurea, veronal |
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| baritone | (adjective) lower in range than tenor and higher than bass | - |
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| (noun) the second lowest brass wind instrument | Synonyms: baritone horn |
| (noun) the second lowest adult male singing voice | Synonyms: baritone voice |
| (noun) a male singer | Synonyms: barytone |
| barytone | (noun) a male singer | Synonyms: baritone |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| bassine | (noun) coarse leaf fiber from palmyra palms used in making brushes and brooms | - |
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| beeline | (noun) the most direct route | - |
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| beguine | (noun) a ballroom dance that originated in the French West Indies; similar to the rumba | - |
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| (noun) music written in the bolero rhythm of the beguine dance | - |
| bellarmine | (noun) a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century) | Synonyms: greybeard, long-beard, longbeard |
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| benedictine | (noun) a French liqueur originally made by Benedictine monks | - |
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| benne | (noun) East Indian annual erect herb; source of sesame seed or benniseed and sesame oil | Synonyms: benni, benny, sesame, Sesamum indicum |
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| benzene | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzine, benzol |
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| benzine | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzene, benzol |
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| benzocaine | (noun) a white crystalline ester used as a local anesthetic | Synonyms: ethyl aminobenzoate |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| benzoquinone | (noun) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes | Synonyms: quinone |
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| betaine | (noun) a sweet tasting alkaloid that occurs in sugar beets | - |
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| bicorne | (noun) a cocked hat with the brim turned up to form two points | Synonyms: bicorn |
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| bilestone | (noun) a calculus formed in the gall bladder or its ducts | Synonyms: gallstone |
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| bine | (noun) European twining plant whose flowers are used chiefly to flavor malt liquors; cultivated in America | Synonyms: common hop, common hops, European hop, Humulus lupulus |
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| biomedicine | (noun) the branch of medical science that studies the ability of organisms to withstand environmental stress (as in space travel) | - |
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| (noun) the branch of medical science that applies biological and physiological principles to clinical practice | - |
| biplane | (noun) old fashioned airplane; has two wings one above the other | - |
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| bisontine | (adjective) relating to or characteristic of bison | - |
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| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| bluestone | (noun) bluish-grey sandstone used for paving and building | - |
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| bombazine | (noun) a twilled fabric used for dresses; the warp is silk and the weft is worsted | - |
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| bone | (adjective) consisting of or made up of bone | - |
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| (noun) a shade of white the color of bleached bones | Synonyms: ivory, off-white, pearl |
| (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 |
| (verb) remove the bones from | Synonyms: debone |
| (verb) study intensively, as before an exam | Synonyms: bone up, cram, drum, get up, grind away, mug up, swot, swot up |
| borderline | (adjective) of questionable or minimal quality | Synonyms: marginal |
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| (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
| 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 | (adjective) of or relating to or belonging to the genus Bos (cattle) | Synonyms: bovid |
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| (adjective) dull and slow-moving and stolid; like an ox | - |
| (noun) any of various members of the genus Bos | - |
| 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 |
| (verb) soak in brine | - |
| 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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| bubaline | (adjective) relating to or resembling a buffalo | - |
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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 | (adjective) relating to or resembling a hawk of the genus Buteo | - |
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| (noun) any hawk of the genus Buteo | - |
| butylene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butene |
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| bygone | (adjective) well in the past; former | Synonyms: bypast, departed, foregone, gone |
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| (noun) past events to be put aside | Synonyms: water under the bridge |
| 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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| (verb) cover with calcimine | - |
| calcine | (verb) heat a substance so that it oxidizes or reduces | - |
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| calycine | (adjective) of or relating to or resembling a calyx | Synonyms: calyceal, calycinal |
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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 | - |
| (verb) beat with a cane | Synonyms: flog, lambast, lambaste |
| canine | (adjective) of or relating to or characteristic of members of the family Canidae | - |
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| (adjective) of or relating to a pointed conical tooth | Synonyms: laniary |
| (noun) any of various fissiped mammals with nonretractile claws and typically long muzzles | Synonyms: canid |
| (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 |
| caprine | (adjective) being or pertaining to or resembling a goat or goats | - |
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| 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 | (adjective) of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies | Synonyms: blood-red, cerise, cherry-red, cherry, crimson, red, reddish, ruby-red, ruby, ruddy, scarlet |
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| (noun) a variable color averaging a vivid red | Synonyms: cardinal |
| (verb) color carmine | - |
| 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 | (adjective) of or related to Old World monkeys that have nostrils together and opening downward | Synonyms: catarrhinian |
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| (noun) of Africa or Arabia or Asia; having nonprehensile tails and nostrils close together | Synonyms: Old World monkey |
| 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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| cauline | (adjective) especially of leaves; growing on a stem especially on the upper part of a stem | - |
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| (adjective) (of plants) producing a well-developed stem above ground | Synonyms: caulescent, stemmed |
| 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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| cervine | (adjective) relating to or resembling deer | - |
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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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| (verb) accompany as a chaperone | Synonyms: chaperon |
| 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 | - |
| (verb) raise trivial objections | Synonyms: carp, cavil |
| (verb) defeat someone through trickery or deceit | Synonyms: cheat, chouse, jockey, screw, shaft |
| chine | (noun) backbone of an animal | - |
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| (noun) cut of meat or fish including at least part of the backbone | - |
| (verb) cut through the backbone of an animal | - |
| 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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