| aside | (noun) a line spoken by an actor to the audience but not intended for others on the stage | - |
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| (noun) a message that departs from the main subject | Synonyms: digression, divagation, excursus, parenthesis |
| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| asteroid | (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autodidact | (noun) a person who has taught himself | - |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| avidness | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, eagerness, keenness |
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| avoidance | (noun) deliberately avoiding; keeping away from or preventing from happening | Synonyms: dodging, shunning, turning away |
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| azide | (noun) a chemical compound containing the azido group combined with an element or radical | - |
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| azoimide | (noun) a colorless explosive liquid that is volatile and poisonous and foul-smelling | Synonyms: HN, hydrazoic acid, hydrogen azide |
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| backside | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| (noun) the side of an object that is opposite its front | Synonyms: back end, rear |
| backslider | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: recidivist, reversionist |
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| backsliding | (noun) a failure to maintain a higher state | Synonyms: lapse, lapsing, relapse, relapsing, reversion, reverting |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteroid | (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
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| bandwidth | (noun) a data transmission rate; the maximum amount of information (bits/second) that can be transmitted along a channel | - |
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| barmaid | (noun) a female bartender | - |
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| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| bedside | (noun) space by the side of a bed (especially the bed of a sick or dying person) | - |
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| bichloride | (noun) a compound containing two chlorine atoms per molecule | Synonyms: dichloride |
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| bicuspid | (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
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| bid | (noun) an attempt to get something | Synonyms: play |
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| (noun) a formal proposal to buy at a specified price | Synonyms: tender |
| (noun) (bridge) the number of tricks a bridge player is willing to contract to make | Synonyms: bidding |
| (noun) an authoritative direction or instruction to do something | Synonyms: bidding, command, dictation |
| bidder | (noun) someone who makes an offer | - |
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| (noun) someone who makes a bid at cards | - |
| bidding | (noun) a request to be present | Synonyms: summons |
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| (noun) (bridge) the number of tricks a bridge player is willing to contract to make | Synonyms: bid |
| (noun) an authoritative direction or instruction to do something | Synonyms: bid, command, dictation |
| biddy | (noun) young bird especially of domestic fowl | Synonyms: chick |
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| (noun) adult female chicken | Synonyms: hen |
| bidet | (noun) a basin for washing genitals and anal area | - |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| blennioid | (noun) elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins | Synonyms: blennioid fish |
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| bolide | (noun) an especially luminous meteor (sometimes exploding) | Synonyms: fireball |
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| bombycid | (noun) moderate-sized Asiatic moth whose larvae feed on mulberry leaves and produce silk | Synonyms: bombycid moth, silkworm moth |
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| bondmaid | (noun) a female slave | Synonyms: bondswoman, bondwoman |
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| (noun) a female bound to serve without wages | Synonyms: bondswoman, bondwoman |
| bovid | (noun) hollow-horned ruminants | - |
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| braid | (noun) trimming used to decorate clothes or curtains | Synonyms: braiding, gold braid |
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| (noun) a hairdo formed by braiding or twisting the hair | Synonyms: plait, tress, twist |
| braiding | (noun) trimming used to decorate clothes or curtains | Synonyms: braid, gold braid |
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| bridal | (noun) archaic terms for a wedding or wedding feast | Synonyms: espousal |
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| bride | (noun) a woman who has recently been married | - |
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| (noun) a woman participant in her own marriage ceremony | - |
| bridecake | (noun) a rich cake with two or more tiers and covered with frosting and decorations; served at a wedding reception | Synonyms: wedding cake |
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| bridegroom | (noun) a man who has recently been married | Synonyms: groom |
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| (noun) a man participant in his own marriage ceremony | Synonyms: groom |
| bridesmaid | (noun) an unmarried woman who attends the bride at a wedding | Synonyms: maid of honor |
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| bridge | (noun) any of various card games based on whist for four players | - |
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| (noun) a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc. | Synonyms: span |
| (noun) an upper deck where a ship is steered and the captain stands | Synonyms: bridge deck |
| (noun) the link between two lenses; rests on the nose | Synonyms: nosepiece |
| (noun) a denture anchored to teeth on either side of missing teeth | Synonyms: bridgework |
| (noun) a wooden support that holds the strings up | - |
| (noun) a circuit consisting of two branches (4 arms arranged in a diamond configuration) across which a meter is connected | Synonyms: bridge circuit |
| (noun) the hard ridge that forms the upper part of the nose | - |
| (noun) something resembling a bridge in form or function | - |
| bridgehead | (noun) an area in hostile territory that has been captured and is held awaiting further troops and supplies | Synonyms: foothold |
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| (noun) a defensive post at the end of a bridge nearest to the enemy | - |
| bridgework | (noun) a denture anchored to teeth on either side of missing teeth | Synonyms: bridge |
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| bridle | (noun) the act of restraining power or action or limiting excess | Synonyms: check, curb |
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| (noun) headgear for a horse; includes a headstall and bit and reins to give the rider or driver control | - |
| bridoon | (noun) a bit resembling a snaffle bit; used with a separate curb | - |
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| broadside | (noun) the simultaneous firing of all the armament on one side of a warship | - |
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| (noun) the whole side of a vessel from stem to stern | - |
| (noun) all of the armament that is fired from one side of a warship | - |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, circular, flier, flyer, handbill, throwaway |
| (noun) a speech of violent denunciation | Synonyms: philippic, tirade |
| bromide | (noun) a trite or obvious remark | Synonyms: banality, cliche, commonplace, platitude |
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| (noun) any of the salts of hydrobromic acid; formerly used as a sedative but now generally replaced by safer drugs | - |
| burnside | (noun) facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off) | Synonyms: mutton chop, side-whiskers, sideburn |
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| cancroid | (noun) the most common form of skin cancer | Synonyms: squamous cell carcinoma |
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| candida | (noun) any of the yeastlike imperfect fungi of the genus Candida | - |
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| candidacy | (noun) the campaign of a candidate to be elected | Synonyms: campaigning, candidature, electioneering, political campaign |
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| candidate | (noun) someone who is considered for something (for an office or prize or honor etc.) | Synonyms: prospect |
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| (noun) a politician who is running for public office | Synonyms: campaigner, nominee |
| candidature | (noun) the campaign of a candidate to be elected | Synonyms: campaigning, candidacy, electioneering, political campaign |
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| candidiasis | (noun) an infection caused by fungi of the genus Monilia or Candida (especially Candida albicans) | Synonyms: monilia disease, moniliasis |
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| candidness | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candor, candour, directness, forthrightness, frankness |
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| canid | (noun) any of various fissiped mammals with nonretractile claws and typically long muzzles | Synonyms: canine |
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| canyonside | (noun) the steeply sloping side of a canyon | - |
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| caprimulgid | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: goatsucker, nightjar |
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| capsid | (noun) the outer covering of protein surrounding the nucleic acid of a virus | - |
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| (noun) a variety of leaf bug | Synonyms: mirid, mirid bug |
| carangid | (noun) a percoid fish of the family Carangidae | Synonyms: carangid fish |
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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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| carcinoid | (noun) a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin | - |
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| cardioid | (noun) an epicycloid in which the rolling circle equals the fixed circle | - |
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| carotenoid | (noun) any of a class of highly unsaturated yellow to red pigments occurring in plants and animals | - |
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| cartridge | (noun) ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun | - |
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| (noun) an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable | Synonyms: pickup |
| (noun) a module designed to be inserted into a larger piece of equipment | - |
| (noun) a light-tight supply chamber holding the film and supplying it for exposure as required | Synonyms: magazine |
| caryatid | (noun) a supporting column carved in the shape of a person | - |
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| cathartid | (noun) large birds of prey superficially similar to Old World vultures | Synonyms: New World vulture |
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| catostomid | (noun) a cypriniform fish of the family Catostomidae | - |
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| ceftazidime | (noun) a parenteral cephalosporin (trade names Fortaz and Tazicef) used to treat moderate infections | Synonyms: Fortaz, Tazicef |
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| ceilidh | (noun) an informal social gathering at which there is Scottish or Irish folk music and singing and folk dancing and story telling | - |
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| celluloid | (noun) a medium that disseminates moving pictures | Synonyms: cinema, film |
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| (noun) highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics | - |
| centrarchid | (noun) small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies, black bass, bluegills, pumpkinseed | Synonyms: sunfish |
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| centroid | (noun) the center of mass of an object of uniform density | - |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| cerebroside | (noun) A cerebroside is any of various organic lipid compounds containing glucose or galactose and glucose; it occurs in the myelin sheath of cerebrospinal neurons. | - |
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| cervid | (noun) distinguished from Bovidae by the male's having solid deciduous antlers | Synonyms: deer |
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| cetrimide | (noun) a cationic detergent that is a powerful disinfectant | - |
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| chalcid | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid fly, chalcid wasp, chalcidfly |
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| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| chambermaid | (noun) a maid who is employed to clean and care for bedrooms (now primarily in hotels) | Synonyms: fille de chambre |
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| chancroid | (noun) infectious venereal ulcer | - |
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| characid | (noun) any freshwater fish of the family Characinidae | Synonyms: characin, characin fish |
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| cheloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: keloid |
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| chiding | (noun) rebuking a person harshly | Synonyms: objurgation, scolding, tongue-lashing |
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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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| 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) | - |
| 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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| chlorothiazide | (noun) a diuretic drug (trade name Diuril) used in the treatment of edema and hypertension | Synonyms: Diuril |
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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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| choroid | (noun) a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye | Synonyms: choroid coat |
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