| duad | (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duet, duo, dyad, pair, span, twain, twosome, yoke |
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| dualism | (noun) the doctrine that reality consists of two basic opposing elements, often taken to be mind and matter (or mind and body), or good and evil | - |
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| dualist | (noun) an adherent of dualism | - |
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| duality | (noun) (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory | Synonyms: wave-particle duality |
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| (noun) (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry | - |
| (noun) being twofold; a classification into two opposed parts or subclasses | Synonyms: dichotomy |
| dub | (noun) the new sounds added by dubbing | - |
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| dubbin | (noun) tallow mixed with oil; used to make leather soft and waterproof | - |
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| dubbing | (noun) a new soundtrack that is added to a film | - |
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| dubiety | (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiousness, incertitude, uncertainty |
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| dubiousness | (noun) uncertainty about the truth or factuality or existence of something | Synonyms: doubt, doubtfulness, question |
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| (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, incertitude, uncertainty |
| dubnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, element 105, hahnium |
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| dubstep | (noun) A genre of electronic music descended from 2-step garage, characterised by its dark mood, sparse, half-step and two-step rhythms, an average bpm of 140 and an emphasis on sub-bass. | - |
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| ducat | (noun) formerly a gold coin of various European countries | - |
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| duce | (noun) leader | - |
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| duchess | (noun) the wife of a duke or a woman holding ducal title in her own right | - |
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| duchy | (noun) the domain controlled by a duke or duchess | Synonyms: dukedom |
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| duck | (noun) small wild or domesticated web-footed broad-billed swimming bird usually having a depressed body and short legs | - |
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| (noun) a heavy cotton fabric of plain weave; used for clothing and tents | - |
| (noun) flesh of a duck (domestic or wild) | - |
| (noun) (cricket) a score of nothing by a batsman | Synonyms: duck's egg |
| duckbill | (noun) small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae | Synonyms: duck-billed platypus, duckbilled platypus, Ornithorhynchus anatinus, platypus |
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| (noun) primitive fish of the Mississippi valley having a long paddle-shaped snout | Synonyms: paddlefish, Polyodon spathula |
| duckboard | (noun) a boardwalk laid across muddy ground | - |
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| ducking | (noun) the act of wetting something by submerging it | Synonyms: dousing, immersion, submersion |
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| (noun) hunting ducks | Synonyms: duck hunting |
| duckling | (noun) young duck | - |
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| (noun) flesh of a young domestic duck | - |
| duckpin | (noun) a bowling pin that is short and squat by comparison with a tenpin | - |
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| duckpins | (noun) a bowling game using a pin smaller than a tenpin but proportionately wider | - |
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| duckweed | (noun) any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds | - |
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| ducky | (noun) a special loved one | Synonyms: darling, dearie, deary, favorite, favourite, pet |
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| duct | (noun) an enclosed conduit for a fluid | - |
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| (noun) a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance | Synonyms: canal, channel, epithelial duct |
| (noun) a continuous tube formed by a row of elongated cells lacking intervening end walls | - |
| ductileness | (noun) the malleability of something that can be drawn into threads or wires or hammered into thin sheets | Synonyms: ductility |
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| ductility | (noun) the malleability of something that can be drawn into threads or wires or hammered into thin sheets | Synonyms: ductileness |
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| ductule | (noun) a very small duct | Synonyms: ductulus |
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| ductulus | (noun) a very small duct | Synonyms: ductule |
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| dud | (noun) an event that fails badly or is totally ineffectual | Synonyms: bomb, turkey |
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| (noun) an explosion that fails to occur | Synonyms: misfire |
| (noun) someone who is unsuccessful | Synonyms: flop, washout |
| dude | (noun) a man who is much concerned with his dress and appearance | Synonyms: beau, clotheshorse, dandy, fashion plate, fop, gallant, sheik, swell |
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| (noun) an informal form of address for a man | Synonyms: buster, fellow |
| dudeen | (noun) a clay pipe with a short stem | - |
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| dudgeon | (noun) a feeling of intense indignation (now used only in the phrase `in high dudgeon') | Synonyms: high dudgeon |
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| duds | (noun) informal terms for clothing | Synonyms: threads, togs |
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| due | (noun) that which is deserved or owed | - |
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| (noun) a payment that is due (e.g., as the price of membership) | - |
| duel | (noun) a prearranged fight with deadly weapons by two people (accompanied by seconds) in order to settle a quarrel over a point of honor | Synonyms: affaire d'honneur |
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| (noun) any struggle between two skillful opponents (individuals or groups) | - |
| dueler | (noun) a person who fights duels | Synonyms: duelist, dueller, duellist |
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| duelist | (noun) a person who fights duels | Synonyms: dueler, dueller, duellist |
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| dueller | (noun) a person who fights duels | Synonyms: dueler, duelist, duellist |
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| duellist | (noun) a person who fights duels | Synonyms: dueler, duelist, dueller |
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| duenna | (noun) a woman chaperon | - |
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| duet | (noun) (ballet) a dance for two people (usually a ballerina and a danseur noble) | Synonyms: pas de deux |
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| (noun) a musical composition for two performers | Synonyms: duette, duo |
| (noun) a pair who associate with one another | Synonyms: couple, duo, twosome |
| (noun) two performers or singers who perform together | Synonyms: duette, duo |
| (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duo, dyad, pair, span, twain, twosome, yoke |
| duette | (noun) a musical composition for two performers | Synonyms: duet, duo |
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| (noun) two performers or singers who perform together | Synonyms: duet, duo |
| duff | (noun) a stiff flour pudding steamed or boiled usually and containing e.g. currants and raisins and citron | Synonyms: plum duff |
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| duffel | (noun) a coarse heavy woolen fabric | Synonyms: duffle |
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| (noun) a large cylindrical bag of heavy cloth; for carrying personal belongings | Synonyms: duffel bag, duffle, duffle bag |
| duffer | (noun) an incompetent or clumsy person | - |
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| duffle | (noun) a coarse heavy woolen fabric | Synonyms: duffel |
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| (noun) a large cylindrical bag of heavy cloth; for carrying personal belongings | Synonyms: duffel, duffel bag, duffle bag |
| dug | (noun) an udder or breast or teat | - |
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| dugong | (noun) sirenian tusked mammal found from eastern Africa to Australia; the flat tail is bilobate | Synonyms: Dugong dugon |
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| dugout | (noun) a fortification of earth; mostly or entirely below ground | Synonyms: bunker |
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| (noun) either of two low shelters on either side of a baseball diamond where the players and coaches sit during the game | - |
| (noun) a canoe made by hollowing out and shaping a large log | Synonyms: dugout canoe, pirogue |
| (noun) a shelter for humans or domesticated animals and livestock based on a hole or depression dug into the ground; can be fully recessed into the earth, with a flat roof covered by ground, semi-recessed, with a constructed wood or sod roof standing out, or dug into a hillside. | Synonyms: dug-out, pit-house, pithouse |
| duke | (noun) a British peer of the highest rank | - |
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| (noun) a nobleman (in various countries) of high rank | - |
| dukedom | (noun) the domain controlled by a duke or duchess | Synonyms: duchy |
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| (noun) the dignity or rank or position of a duke | - |
| dulciana | (noun) the organ stop having a tone of soft sweet string quality | - |
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| dulcimer | (noun) a trapezoidal zither whose metal strings are struck with light hammers | - |
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| (noun) a stringed instrument used in American folk music; an elliptical body and a fretted fingerboard and three strings | - |
| dulcinea | (noun) a woman who is a man's sweetheart | Synonyms: ladylove |
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| dullard | (noun) a person who evokes boredom | Synonyms: bore |
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| (noun) a person who is not very bright | Synonyms: dolt, pillock, poor fish, pudden-head, pudding head, stupe, stupid, stupid person |
| dullness | (noun) lack of sensibility | - |
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| (noun) without sharpness or clearness of edge or point | Synonyms: bluntness |
| (noun) the quality of lacking interestingness | - |
| (noun) a lack of visual brightness | - |
| (noun) the quality of being slow to understand | Synonyms: obtuseness |
| dulse | (noun) coarse edible red seaweed | Synonyms: Rhodymenia palmata |
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| dumbass | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| dumbbell | (noun) an exercising weight; two spheres connected by a short bar that serves as a handle | - |
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| (noun) an ignorant or foolish person | Synonyms: boob, booby, dope, dummy, pinhead |
| dumbness | (noun) the quality of being mentally slow and limited | Synonyms: denseness, slow-wittedness |
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| dumbwaiter | (noun) a small elevator used to convey food (or other goods) from one floor of a building to another | Synonyms: food elevator |
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| dumdum | (noun) a soft-nosed small-arms bullet that expands when it hits a target and causes a gaping wound | Synonyms: dumdum bullet |
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| dummy | (noun) a figure representing the human form | - |
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| (noun) a cartridge containing an explosive charge but no bullet | Synonyms: blank, blank shell |
| (noun) an ignorant or foolish person | Synonyms: boob, booby, dope, dumbbell, pinhead |
| (noun) a person who does not talk | Synonyms: silent person |
| dump | (noun) a place where supplies can be stored | - |
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| (noun) (computer science) a copy of the contents of a computer storage device; sometimes used in debugging programs | - |
| (noun) a piece of land where waste materials are dumped | Synonyms: dumpsite, garbage dump, rubbish dump, trash dump, waste-yard, wasteyard |
| (noun) a coarse term for defecation | Synonyms: shit |
| dumpcart | (noun) a cart that can be tilted to empty contents without handling | - |
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| dumper | (noun) truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity | Synonyms: dump truck, tip truck, tipper, tipper lorry, tipper truck |
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| dumpiness | (noun) a short and stout physique | Synonyms: squattiness |
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| dumping | (noun) selling goods abroad at a price below that charged in the domestic market | - |
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| dumpling | (noun) small balls or strips of boiled or steamed dough | Synonyms: dumplings |
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| (noun) dessert made by baking fruit wrapped in pastry | - |
| dumplings | (noun) small balls or strips of boiled or steamed dough | Synonyms: dumpling |
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| dumps | (noun) an informal expression for a mildly depressed state | Synonyms: mopes |
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| dumpsite | (noun) a piece of land where waste materials are dumped | Synonyms: dump, garbage dump, rubbish dump, trash dump, waste-yard, wasteyard |
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| dun | (noun) horse of a dull brownish grey color | - |
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| (noun) a color or pigment varying around a light grey-brown color | Synonyms: fawn, grayish brown, greyish brown |
| dunce | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| dunderhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| dune | (noun) a ridge of sand created by the wind; found in deserts or near lakes and oceans | Synonyms: sand dune |
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| dung | (noun) fecal matter of animals | Synonyms: droppings, muck |
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| dungaree | (noun) a coarse durable twill-weave cotton fabric | Synonyms: denim, jean |
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| dungeon | (noun) the main tower within the walls of a medieval castle or fortress | Synonyms: donjon, keep |
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| (noun) a dark cell (usually underground) where prisoners can be confined | - |
| dunghill | (noun) a heap of dung or refuse | Synonyms: midden, muckheap, muckhill |
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| (noun) a foul or degraded condition | - |
| dunk | (noun) a basketball shot in which the basketball is propelled downward into the basket | Synonyms: dunk shot, stuff shot |
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| dunker | (noun) a basketball player who is able to make dunk shots | - |
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| (noun) an eater who dips food into a liquid before eating it | - |
| dunlin | (noun) small common sandpiper that breeds in northern or Arctic regions and winters in southern United States or Mediterranean regions | Synonyms: Erolia alpina, red-backed sandpiper |
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| dunnock | (noun) small brownish European songbird | Synonyms: hedge sparrow, Prunella modularis, sparrow |
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| duo | (noun) a musical composition for two performers | Synonyms: duet, duette |
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| (noun) a pair who associate with one another | Synonyms: couple, duet, twosome |
| (noun) two performers or singers who perform together | Synonyms: duet, duette |
| (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, dyad, pair, span, twain, twosome, yoke |
| duodecimal | (noun) one part in twelve equal parts | Synonyms: one-twelfth, twelfth, twelfth part |
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| duodenum | (noun) the part of the small intestine between the stomach and the jejunum | - |
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| duodiode | (noun) an electron tube having two diodes in the same envelope, with either a common cathode or separate cathodes. | - |
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| duologue | (noun) a part of the script in which the speaking roles are limited to two actors | - |
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| (noun) a conversation between two persons | Synonyms: dialog, dialogue |
| duomo | (noun) the principal Christian church building of a bishop's diocese | Synonyms: cathedral |
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| dupe | (noun) a person who is tricked or swindled | Synonyms: victim |
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| dupery | (noun) something intended to deceive; deliberate trickery intended to gain an advantage | Synonyms: fraud, fraudulence, hoax, humbug, put-on |
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| duplex | (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
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| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| duplicability | (noun) the quality of being reproducible | Synonyms: reproducibility |
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| duplicate | (noun) a copy that corresponds to an original exactly | Synonyms: duplication |
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| (noun) something additional of the same kind | Synonyms: extra |
| duplication | (noun) the act of copying or making a duplicate (or duplicates) of something | Synonyms: gemination |
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| (noun) a copy that corresponds to an original exactly | Synonyms: duplicate |
| duplicator | (noun) apparatus that makes copies of typed, written or drawn material | Synonyms: copier |
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| duplicity | (noun) acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another | Synonyms: double-dealing |
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| (noun) a fraudulent or duplicitous representation | Synonyms: fraudulence |
| dura | (noun) the outermost (and toughest) of the 3 meninges | Synonyms: dura mater |
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