| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| arb | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arbitrager, arbitrageur |
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| arbalest | (noun) late version of the crossbow with a steel bow | Synonyms: arbalist |
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| arbalist | (noun) late version of the crossbow with a steel bow | Synonyms: arbalest |
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| (noun) archer who uses an arbalest | - |
| arbiter | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbitrator, umpire |
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| (noun) someone with the power to settle matters at will | Synonyms: supreme authority |
| arbitrage | (noun) a kind of hedged investment meant to capture slight differences in price; when there is a difference in the price of something on two different markets the arbitrageur simultaneously buys at the lower price and sells at the higher price | - |
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| arbitrager | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrageur |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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| arbitration | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitrement |
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| (noun) (law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management) | - |
| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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| arbor | (noun) a framework that supports climbing plants | Synonyms: arbour, bower, pergola |
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| (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: mandrel, mandril, spindle |
| (noun) tree (as opposed to shrub) | - |
| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| arbour | (noun) a framework that supports climbing plants | Synonyms: arbor, bower, pergola |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| barb | (noun) one of the parallel filaments projecting from the main shaft of a feather | - |
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| (noun) a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove | - |
| (noun) the pointed part of barbed wire | - |
| (noun) an aggressive remark directed at a person like a missile and intended to have a telling effect | Synonyms: dig, gibe, jibe, shaft, shot, slam |
| barbacan | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbican |
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| barbarian | (noun) a member of an uncivilized people | Synonyms: savage |
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| (noun) a crude uncouth ill-bred person lacking culture or refinement | Synonyms: boor, churl, Goth, peasant, tike, tyke |
| barbarisation | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarization |
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| barbarism | (noun) a brutal barbarous savage act | Synonyms: barbarity, brutality, savagery |
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| barbarity | (noun) a brutal barbarous savage act | Synonyms: barbarism, brutality, savagery |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarousness, heinousness |
| barbarization | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarisation |
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| barbarousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarity, heinousness |
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| barbasco | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: Jacquinia keyensis, joewood |
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| barbecue | (noun) a rack to hold meat for cooking over hot charcoal usually out of doors | Synonyms: barbeque |
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| (noun) a cookout in which food is cooked over an open fire; especially a whole animal carcass roasted on a spit | Synonyms: barbeque |
| (noun) meat that has been barbecued or grilled in a highly seasoned sauce | Synonyms: barbeque |
| barbecuing | (noun) roasting a large piece of meat on a revolving spit out of doors over an open fire | - |
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| barbel | (noun) slender tactile process on the jaws of a fish | Synonyms: feeler |
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| barbell | (noun) a bar to which heavy discs are attached at each end; used in weightlifting | - |
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| barbeque | (noun) a rack to hold meat for cooking over hot charcoal usually out of doors | Synonyms: barbecue |
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| (noun) a cookout in which food is cooked over an open fire; especially a whole animal carcass roasted on a spit | Synonyms: barbecue |
| (noun) meat that has been barbecued or grilled in a highly seasoned sauce | Synonyms: barbecue |
| barber | (noun) a hairdresser who cuts hair and shaves beards as a trade | - |
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| barberry | (noun) any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries | - |
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| barbershop | (noun) a shop where men can get their hair cut | - |
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| barbet | (noun) small brightly colored stout-billed tropical bird having short weak wings | - |
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| barbette | (noun) (formerly) a mound of earth inside a fort from which heavy gun can be fired over the parapet | - |
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| barbican | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbacan |
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| barbital | (noun) a barbiturate used as a hypnotic | Synonyms: barbitone, diethylbarbituric acid, diethylmalonylurea, veronal |
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| barbitone | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, diethylbarbituric acid, diethylmalonylurea, veronal |
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| barbiturate | (noun) organic compound having powerful soporific effect; overdose can be fatal | - |
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| barbu | (noun) found along western Atlantic coast | Synonyms: Polydactylus virginicus |
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| barbwire | (noun) strong wire with barbs at regular intervals used to prevent passage | Synonyms: barbed wire |
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| bearberry | (noun) chiefly evergreen subshrubs of northern to Arctic areas | - |
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| (noun) deciduous shrub of southeastern and central United States | Synonyms: Ilex decidua, possum haw, winterberry |
| (noun) shrubby tree of the Pacific coast of the United States; yields cascara sagrada | Synonyms: bearwood, cascara buckthorn, chittamwood, chittimwood, Rhamnus purshianus |
| bicarbonate | (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate | Synonyms: hydrogen carbonate |
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| carbamate | (noun) a salt (or ester) of carbamic acid | - |
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| carbamide | (noun) the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics | Synonyms: urea |
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| carbide | (noun) a binary compound of carbon with a more electropositive element | - |
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| carbine | (noun) light automatic rifle | - |
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| carbineer | (noun) a soldier (historically a mounted soldier) who is armed with a carbine | Synonyms: carabineer, carabinier |
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| carbohydrate | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: saccharide, sugar |
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| carbomycin | (noun) a colorless basic antibiotic that inhibits the growth of Gram-positive organisms | - |
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| carbon | (noun) a copy made with carbon paper | Synonyms: carbon copy |
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| (noun) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds | Synonyms: atomic number 6, C |
| (noun) a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper | Synonyms: carbon paper |
| carbonado | (noun) a piece of meat (or fish) that has been scored and broiled | - |
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| (noun) an inferior dark diamond used in industry for drilling and polishing | Synonyms: black diamond |
| carbonara | (noun) sauce for pasta; contains eggs and bacon or ham and grated cheese | - |
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| carbonate | (noun) a salt or ester of carbonic acid (containing the anion CO3) | - |
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| carbonation | (noun) saturation with carbon dioxide (as soda water) | - |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| carbonisation | (noun) the destructive distillation of coal (as in coke ovens) | Synonyms: carbonization |
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| carbonization | (noun) the destructive distillation of coal (as in coke ovens) | Synonyms: carbonisation |
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| carbonyl | (noun) a compound containing metal combined with carbon monoxide | - |
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| carborundum | (noun) an abrasive composed of silicon carbide crystals | - |
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| carboxyl | (noun) the univalent radical -COOH; present in and characteristic of organic acids | Synonyms: carboxyl group |
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| carboy | (noun) a large bottle for holding corrosive liquids; usually cushioned in a special container | - |
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| carbuncle | (noun) an infection larger than a boil and with several openings for discharge of pus | - |
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| (noun) deep-red cabochon garnet cut without facets | - |
| carburetor | (noun) mixes air with gasoline vapor prior to explosion | Synonyms: carburettor |
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| carburettor | (noun) mixes air with gasoline vapor prior to explosion | Synonyms: carburetor |
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| cedarbird | (noun) widely distributed over temperate North America | Synonyms: Bombycilla cedrorun, cedar waxwing |
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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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| cocarboxylase | (noun) a coenzyme important in respiration in the Krebs cycle | Synonyms: thiamine pyrophosphate |
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| collarbone | (noun) bone linking the scapula and sternum | Synonyms: clavicle |
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| decarboxylase | (noun) any of the enzymes that hydrolize the carboxyl group | - |
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| decarboxylation | (noun) the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen) | - |
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| fluorocarbon | (noun) a halocarbon in which some hydrogen atoms have been replaced by fluorine; used in refrigerators and aerosols | - |
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| garb | (noun) clothing of a distinctive style or for a particular occasion | Synonyms: attire, dress |
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| garbage | (noun) a receptacle where waste can be discarded | - |
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| (noun) a worthless message | Synonyms: drivel |
| (noun) food that is discarded (as from a kitchen) | Synonyms: food waste, refuse, scraps |
| garbageman | (noun) someone employed to collect and dispose of refuse | Synonyms: dustman, garbage carter, garbage collector, garbage hauler, garbage man, refuse collector |
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| garbanzo | (noun) large white roundish Asiatic legume; usually dried | Synonyms: chickpea |
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| (noun) the seed of the chickpea plant | Synonyms: chickpea |
| garboard | (noun) the first wale laid next to the keel of a wooden ship | Synonyms: garboard plank, garboard strake |
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| garboil | (noun) a state of commotion and noise and confusion | Synonyms: tumult, tumultuousness, uproar |
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| garbology | (noun) the study of a society by analyzing its garbage | - |
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| gearbox | (noun) the shell (metal casing) in which a train of gears is sealed | Synonyms: gear box, gear case |
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| halocarbon | (noun) one of various compounds of carbon and any of the halogens | - |
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| harbinger | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, herald, precursor, predecessor |
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| harbor | (noun) a place of refuge and comfort and security | Synonyms: harbour |
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| (noun) a sheltered port where ships can take on or discharge cargo | Synonyms: harbour, haven, seaport |
| harborage | (noun) (nautical) a place of refuge (as for a ship) | Synonyms: harbourage |
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| harbour | (noun) a place of refuge and comfort and security | Synonyms: harbor |
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| (noun) a sheltered port where ships can take on or discharge cargo | Synonyms: harbor, haven, seaport |
| harbourage | (noun) (nautical) a place of refuge (as for a ship) | Synonyms: harborage |
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| hydrocarbon | (noun) an organic compound containing only carbon and hydrogen | - |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| hypercarbia | (noun) the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood | Synonyms: hypercapnia |
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| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
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| larboard | (noun) the left side of a ship or aircraft to someone who is aboard and facing the bow or nose | Synonyms: port |
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