| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrology | (noun) a pseudoscience claiming divination by the positions of the planets and sun and moon | Synonyms: star divination |
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| asystole | (noun) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death | Synonyms: cardiac arrest, cardiopulmonary arrest |
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| atenolol | (noun) an oral beta blocker (trade name Tenormin) used in treating hypertension and angina; has adverse side effects (depression and exacerbation of congestive heart failure etc.) | Synonyms: Tenormin |
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| atole | (noun) eaten as mush or as a thin gruel | - |
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| atoll | (noun) an island consisting of a circular coral reef surrounding a lagoon | - |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| aureole | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, gloriole, glory, halo, nimbus |
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| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: corona |
| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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| axiology | (noun) the study of values and value judgments | - |
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| axolemma | (noun) outer membrane covering an axon | - |
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| axolotl | (noun) larval salamander of mountain lakes of Mexico that usually lives without metamorphosing | Synonyms: Ambystoma mexicanum, mud puppy |
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| ayatollah | (noun) a high-ranking Shiite religious leader who is regarded as an authority on religious law and its interpretation and who has political power as well | - |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bandoleer | (noun) a broad cartridge belt worn over the shoulder by soldiers | Synonyms: bandolier |
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| bandolier | (noun) a broad cartridge belt worn over the shoulder by soldiers | Synonyms: bandoleer |
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| bankroll | (noun) a roll of currency notes (often taken as the resources of a person or business etc.) | Synonyms: roll |
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| barcarole | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarolle |
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| barcarolle | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarole |
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| bardolatry | (noun) the idolization of William Shakespeare | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| batholite | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholith, pluton, plutonic rock |
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| batholith | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholite, pluton, plutonic rock |
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| bedroll | (noun) bedding rolled up for carrying | - |
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| befooling | (noun) derision of someone or something as foolish or absurd or inconsistent | Synonyms: stultification |
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| beholder | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: observer, perceiver, percipient |
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| beholding | (noun) perception by means of the eyes | Synonyms: seeing, visual perception |
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| benevolence | (noun) an act intending or showing kindness and good will | Synonyms: benefaction |
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| (noun) an inclination to do kind or charitable acts | - |
| (noun) disposition to do good | - |
| benzol | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzene, benzine |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bibliopole | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopolist |
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| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| billfold | (noun) a pocket-size case for holding papers and paper money | Synonyms: notecase, pocketbook, wallet |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| biologism | (noun) use of biological principles in explaining human especially social behavior | - |
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| biologist | (noun) (biology) a scientist who studies living organisms | Synonyms: life scientist |
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| biology | (noun) the science that studies living organisms | Synonyms: biological science |
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| (noun) all the plant and animal life of a particular region | Synonyms: biota |
| (noun) characteristic life processes and phenomena of living organisms | - |
| bioluminescence | (noun) luminescence produced by physiological processes (as in the firefly) | - |
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| biotechnology | (noun) the branch of engineering science in which biological science is used to study the relation between workers and their environments | Synonyms: bioengineering, ergonomics |
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| (noun) the branch of molecular biology that studies the use of microorganisms to perform specific industrial processes | Synonyms: biotech |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| blindfold | (noun) a cloth used to cover the eyes | - |
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| blolly | (noun) evergreen climbing shrub of southern Florida and West Indies grown for its racemes of fragrant white to creamy flowers followed by globose white succulent berries | Synonyms: Chiococca alba, West Indian snowberry |
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| blowhole | (noun) a hole for the escape of gas or air | Synonyms: vent-hole, vent, venthole |
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| (noun) the spiracle of a cetacean located far back on the skull | - |
| bobolink | (noun) migratory American songbird | Synonyms: Dolichonyx oryzivorus, reedbird, ricebird |
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| bola | (noun) a rope with weights attached to the ends; is thrown to entangle the legs of an animal; of South American origin | - |
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| (noun) a cord fastened around the neck with an ornamental clasp and worn as a necktie | Synonyms: bola tie, bolo, bolo tie |
| bold | (noun) a typeface with thick heavy lines | Synonyms: bold face, boldface |
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| boldface | (noun) a typeface with thick heavy lines | Synonyms: bold, bold face |
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| boldness | (noun) the trait of being willing to undertake things that involve risk or danger | Synonyms: daring, hardihood, hardiness |
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| (noun) the quality of standing out strongly and distinctly | Synonyms: strikingness |
| (noun) impudent aggressiveness | Synonyms: brass, cheek, face, nerve |
| bole | (noun) the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber | Synonyms: tree trunk, trunk |
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| (noun) a soft oily clay used as a pigment (especially a reddish brown pigment) | - |
| bolero | (noun) a Spanish dance in triple time accompanied by guitar and castanets | - |
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| (noun) a short jacket; worn mostly by women | - |
| (noun) music written in the rhythm of the bolero dance | - |
| bolete | (noun) any fungus of the family Boletaceae | - |
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| bolide | (noun) an especially luminous meteor (sometimes exploding) | Synonyms: fireball |
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| bolivar | (noun) the basic unit of money in Venezuela; equal to 100 centimos | - |
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| bolivia | (noun) a form of canasta in which sequences can be melded | - |
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| boliviano | (noun) the basic unit of money in Bolivia; equal to 100 centavos | - |
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| boll | (noun) the rounded seed-bearing capsule of a cotton or flax plant | - |
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| bollard | (noun) a strong post (as on a wharf or quay or ship for attaching mooring lines) | Synonyms: bitt |
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| bollock | (noun) a pulley-block at the head of a topmast | Synonyms: bullock block |
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| (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, egg, nut, orchis, testicle, testis |
| bollworm | (noun) any of various moth caterpillars that destroy cotton bolls | - |
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| bolo | (noun) long heavy knife with a single edge; of Philippine origin | Synonyms: bolo knife |
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| (noun) a cord fastened around the neck with an ornamental clasp and worn as a necktie | Synonyms: bola, bola tie, bolo tie |
| bologna | (noun) large smooth-textured smoked sausage of beef and veal and pork | Synonyms: Bologna sausage |
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| bologram | (noun) record or recording made by a bolometer | Synonyms: bolograph |
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| bolograph | (noun) record or recording made by a bolometer | Synonyms: bologram |
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| bolometer | (noun) an instrument that measures heat radiation; extremely sensitive | - |
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| boloney | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| bolshie | (noun) emotionally charged terms used to refer to extreme radicals or revolutionaries | Synonyms: Bolshevik, bolshy, Marxist, red |
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| bolshy | (noun) emotionally charged terms used to refer to extreme radicals or revolutionaries | Synonyms: Bolshevik, bolshie, Marxist, red |
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| bolster | (noun) a pillow that is often put across a bed underneath the regular pillows | Synonyms: long pillow |
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| bolt | (noun) a sudden abandonment (as from a political party) | - |
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| (noun) the act of moving with great haste | Synonyms: dash |
| (noun) a screw that screws into a nut to form a fastener | - |
| (noun) the part of a lock that is engaged or withdrawn with a key | Synonyms: deadbolt |
| (noun) a sliding bar in a breech-loading firearm that ejects an empty cartridge and replaces it and closes the breech | - |
| (noun) a roll of cloth or wallpaper of a definite length | - |
| (noun) a discharge of lightning accompanied by thunder | Synonyms: bolt of lightning, thunderbolt |
| bolti | (noun) important food fish of the Nile and other rivers of Africa and Asia Minor | Synonyms: Tilapia nilotica |
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| bolus | (noun) a large pill; used especially in veterinary medicine | - |
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| (noun) a small round soft mass (as of chewed food) | - |
| bondholder | (noun) a holder of bonds issued by a government or corporation | - |
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| borecole | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: Brassica oleracea acephala, cole, colewort, kail, kale |
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| bracteole | (noun) a small bract | Synonyms: bractlet |
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| brassavola | (noun) any of various tropical American orchids with usually solitary fleshy leaves and showy white to green nocturnally fragrant blossoms solitary or in racemes of up to 7 | - |
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| bricolage | (noun) construction of something by whatever material are available | - |
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| bricole | (noun) catapult operated by manpower pulling cords attached to a lever and slign to launch projectiles | Synonyms: mangonel, traction trebuchet |
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| broccoli | (noun) branched green undeveloped flower heads | - |
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| (noun) plant with dense clusters of tight green flower buds | Synonyms: Brassica oleracea italica |
| brolly | (noun) colloquial terms for an umbrella | Synonyms: gamp |
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| bronchiole | (noun) any of the smallest bronchial ducts; ending in alveoli | - |
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| bronchiolitis | (noun) inflammation of the membranes lining the bronchioles | - |
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| bucolic | (noun) a short poem descriptive of rural or pastoral life | Synonyms: eclogue, idyl, idyll |
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| (noun) a country person | Synonyms: peasant, provincial |
| bugologist | (noun) a zoologist who studies insects | Synonyms: bug-hunter, entomologist |
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| bugology | (noun) the branch of zoology that studies insects | Synonyms: entomology |
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| bunghole | (noun) a hole in a barrel or cask; used to fill or empty it | - |
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| (noun) vulgar slang for anus | Synonyms: arse, arsehole, asshole |
| butanol | (noun) a flammable alcohol derived from butanes and used for solvents | Synonyms: butyl alcohol |
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| buttonhole | (noun) a hole through which buttons are pushed | Synonyms: button hole |
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| cabriolet | (noun) small two-wheeled horse-drawn carriage; with two seats and a folding hood | Synonyms: cab |
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| cajolery | (noun) flattery intended to persuade | Synonyms: blandishment, palaver |
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| cakehole | (noun) informal terms for the mouth | Synonyms: gob, hole, maw, trap, yap |
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| calceolaria | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: slipperwort |
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| calciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: cholecalciferol, D, ergocalciferol, viosterol, vitamin D |
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| camisole | (noun) a short negligee | - |
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| (noun) a short sleeveless undergarment for women | Synonyms: underbodice |
| campstool | (noun) a folding stool | - |
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