| aforethought | (adjective) with planning and intention | Synonyms: planned, plotted |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| albuginea | (noun) whitish tunic | - |
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| arugula | (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket, rocket salad, roquette |
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| augend | (noun) a number to which another number (the addend) is added | - |
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| auger | (noun) hand tool for boring holes | Synonyms: gimlet, screw auger, wimble |
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| (noun) a long flexible steel coil for dislodging stoppages in curved pipes | Synonyms: plumber's snake, snake |
| aught | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
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| augite | (noun) dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium | - |
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| augitic | (adjective) of or relating to or containing the mineral augite | - |
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| augment | (verb) grow or intensify | - |
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| (verb) enlarge or increase | - |
| augmentation | (noun) the act of augmenting | - |
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| (noun) the statement of a theme in notes of greater duration (usually twice the length of the original) | - |
| (noun) the amount by which something becomes greater | - |
| augmentative | (adjective) increasing or having the power to increase especially in size or amount or degree | - |
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| (adjective) intensifying by augmentation and enhancement | Synonyms: enhancive |
| augmented | (adjective) added to or made greater in amount or number or strength | - |
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| augur | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: auspex |
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| (verb) indicate, as with a sign or an omen | Synonyms: auspicate, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| (verb) predict from an omen | - |
| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| august | (adjective) profoundly honored | Synonyms: revered, venerable |
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| (adjective) of or befitting a lord | Synonyms: grand, lordly |
| autosuggestion | (noun) a system for self-improvement developed by Emile Coue which was popular in the 1920s and 1930s | Synonyms: auto-suggestion, self-suggestion |
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| beaugregory | (noun) a blue and yellow damselfish of Bermuda and Florida and the West Indies | Synonyms: Pomacentrus leucostictus |
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| bedbug | (noun) bug of temperate regions that infests especially beds and feeds on human blood | Synonyms: bed bug, chinch, Cimex lectularius |
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| bellylaugh | (verb) laugh a deep, hearty laugh | - |
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| beluga | (noun) valuable source of caviar and isinglass; found in Black and Caspian seas | Synonyms: Acipenser huso, hausen, white sturgeon |
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| (noun) small northern whale that is white when adult | Synonyms: Delphinapterus leucas, white whale |
| borough | (noun) one of the administrative divisions of a large city | - |
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| (noun) an English town that forms the constituency of a member of parliament | - |
| bougainvillea | (noun) any of several South American ornamental woody vines of the genus Bougainvillea having brilliant red or purple flower bracts; widely grown in warm regions | - |
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| bough | (noun) any of the larger branches of a tree | - |
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| boughed | (adjective) having boughs (of trees) | - |
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| boughless | (adjective) having no boughs (of trees) | - |
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| boughten | (adjective) purchased; not homemade | Synonyms: store-bought |
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| breakthrough | (noun) a penetration of a barrier such as an enemy's defense | - |
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| (noun) making an important discovery | - |
| (noun) a productive insight | Synonyms: discovery, find |
| brougham | (noun) a sedan that has no roof over the driver's seat | - |
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| (noun) light carriage; pulled by a single horse | - |
| bug | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: hemipteran, hemipteron, hemipterous insect |
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| (noun) general term for any insect or similar creeping or crawling invertebrate | - |
| (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: germ, microbe |
| (noun) a small hidden microphone; for listening secretly | - |
| (noun) a fault or defect in a computer program, system, or machine | Synonyms: glitch |
| (verb) annoy persistently | Synonyms: badger, beleaguer, pester, tease |
| (verb) tap a telephone or telegraph wire to get information | Synonyms: intercept, tap, wiretap |
| bugaboo | (noun) a source of concern | - |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugbear |
| 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 |
| bugbear | (noun) an object of dread or apprehension | Synonyms: hobgoblin |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugaboo |
| bugged | (adjective) having hidden electronic eavesdropping devices | Synonyms: wired |
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| bugger | (noun) someone who engages in anal copulation (especially a male who engages in anal copulation with another male) | Synonyms: sod, sodomist, sodomite |
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| (verb) practice anal sex upon | Synonyms: sodomise, sodomize |
| buggery | (noun) intercourse via the anus, committed by a man with a man or woman | Synonyms: anal intercourse, anal sex, sodomy |
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| bugginess | (noun) the state of having bugs | - |
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| buggy | (adjective) infested with bugs | - |
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| (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
| (noun) a small lightweight carriage; drawn by a single horse | Synonyms: roadster |
| bugle | (noun) a brass instrument without valves; used for military calls and fanfares | - |
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| (noun) a tubular glass or plastic bead sewn onto clothing for decoration | - |
| (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugleweed |
| (verb) play on a bugle | - |
| bugler | (noun) someone who plays a bugle | - |
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| bugleweed | (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugle |
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| (noun) a mildly narcotic and astringent aromatic herb having small whitish flowers; eastern United States | Synonyms: Lycopus virginicus |
| bugloss | (noun) perennial or biennial herb cultivated for its delicate usually blue flowers | Synonyms: alkanet, Anchusa officinalis |
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| (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bitterweed, bristly oxtongue, oxtongue, Picris echioides |
| 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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| calcifugous | (adjective) growing or living in acid soil | - |
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| centrifugal | (adjective) tending to move away from a center | - |
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| (adjective) tending away from centralization, as of authority | - |
| (adjective) conveying information to the muscles from the CNS | Synonyms: motor |
| centrifugate | (verb) rotate at very high speed in order to separate the liquids from the solids | Synonyms: centrifuge |
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| centrifugation | (noun) the process of separating substances of different densities by the use of a centrifuge | - |
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| centrifuge | (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: extractor, separator |
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| (verb) rotate at very high speed in order to separate the liquids from the solids | Synonyms: centrifugate |
| chaulmugra | (noun) East Indian tree with oily seeds yield chaulmoogra oil used to treat leprosy | Synonyms: chaulmoogra, chaulmoogra tree, Hydnocarpus kurzii, Taraktagenos kurzii, Taraktogenos kurzii |
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| chough | (noun) a European corvine bird of small or medium size with red legs and glossy black plumage | - |
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| chug | (noun) the dull explosive noise made by an engine | - |
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| (verb) make a dull, explosive sound | - |
| colugo | (noun) arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps | Synonyms: flying cat, flying lemur |
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| conjugal | (adjective) of or relating to marriage or to the relationship between a wife and husband | Synonyms: connubial |
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| conjugally | (adverb) in a conjugal manner | Synonyms: connubial |
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| conjugate | (adjective) (of a pinnate leaflet) having only one pair of leaflets | - |
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| (adjective) joined together especially in a pair or pairs | Synonyms: conjugated, coupled |
| (adjective) of an organic compound; containing two or more double bonds each separated from the other by a single bond | Synonyms: conjugated |
| (adjective) formed by the union of two compounds | Synonyms: conjugated |
| (noun) a mixture of two partially miscible liquids A and B produces two conjugate solutions: one of A in B and another of B in A | Synonyms: conjugate solution |
| (verb) unite chemically so that the product is easily broken down into the original compounds | - |
| (verb) undergo conjugation | - |
| (verb) add inflections showing person, number, gender, tense, aspect, etc. | - |
| conjugated | (adjective) joined together especially in a pair or pairs | Synonyms: conjugate, coupled |
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| (adjective) of an organic compound; containing two or more double bonds each separated from the other by a single bond | Synonyms: conjugate |
| (adjective) formed by the union of two compounds | Synonyms: conjugate |
| conjugation | (noun) the act of pairing a male and female for reproductive purposes | Synonyms: coupling, mating, pairing, sexual union, union |
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| (noun) the act of making or becoming a single unit | Synonyms: jointure, unification, union, uniting |
| (noun) a class of verbs having the same inflectional forms | - |
| (noun) the complete set of inflected forms of a verb | - |
| (noun) the inflection of verbs | - |
| (noun) the state of being joined together | Synonyms: colligation, conjunction, junction |
| corrugate | (verb) fold into ridges | - |
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| corrugated | (adjective) shaped into alternating parallel grooves and ridges | - |
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| corrugation | (noun) the act of shaping into parallel ridges and grooves | - |
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| (noun) a ridge on a corrugated surface | - |
| corticifugal | (adjective) of a nerve fiber passing outward from the cerebral cortex | Synonyms: corticoefferent, corticofugal |
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| corticofugal | (adjective) of a nerve fiber passing outward from the cerebral cortex | Synonyms: corticifugal, corticoefferent |
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| cougar | (noun) large American feline resembling a lion | Synonyms: catamount, Felis concolor, mountain lion, painter, panther, puma |
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| cough | (noun) a sudden noisy expulsion of air from the lungs that clears the air passages; a common symptom of upper respiratory infection or bronchitis or pneumonia or tuberculosis | Synonyms: coughing |
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| (verb) exhale abruptly, as when one has a chest cold or congestion | - |
| coughing | (noun) a sudden noisy expulsion of air from the lungs that clears the air passages; a common symptom of upper respiratory infection or bronchitis or pneumonia or tuberculosis | Synonyms: cough |
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| crotonbug | (noun) small light-brown cockroach brought to United States from Europe; a common household pest | Synonyms: Blattella germanica, Croton bug, German cockroach, water bug |
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| daughter | (noun) a female human offspring | Synonyms: girl |
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| daughterly | (adjective) befitting a daughter | - |
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| debug | (verb) locate and correct errors in a computer program code | - |
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| debugger | (noun) a program that helps in locating and correcting programming errors | - |
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| deluge | (noun) a heavy rain | Synonyms: cloudburst, downpour, pelter, soaker, torrent, waterspout |
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| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: alluvion, flood, inundation |
| (noun) an overwhelming number or amount | Synonyms: flood, inundation, torrent |
| (verb) fill or cover completely, usually with water | Synonyms: inundate, submerge |
| (verb) charge someone with too many tasks | Synonyms: flood out, overwhelm |
| (verb) fill quickly beyond capacity; as with a liquid | Synonyms: flood, inundate, swamp |
| difflugia | (noun) a protozoan with an ovoid shell of cemented sand grains | - |
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| distraught | (adjective) deeply agitated especially from emotion | Synonyms: overwrought |
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| doodlebug | (noun) the larva of any of several insects | Synonyms: ant lion, antlion |
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| (noun) a small jet-propelled winged missile that carries a bomb | Synonyms: buzz bomb, flying bomb, robot bomb, V-1 |
| (noun) a small motor vehicle | - |
| dough | (noun) a flour mixture stiff enough to knead or roll | - |
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| (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, gelt, kale, lettuce, lolly, loot, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| doughboy | (noun) a rounded lump of dough that is deep-fried and served as hot bread | - |
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| (noun) an American infantryman in World War I | - |
| doughiness | (noun) The quality or state of having the characteristics of dough, especially in appearance or consistency. | - |
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| doughnut | (noun) a small ring-shaped friedcake | Synonyms: donut, sinker |
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| (noun) a toroidal shape | Synonyms: anchor ring, annulus, halo, ring |
| doughy | (adjective) having the consistency of dough because of insufficient leavening or improper cooking | Synonyms: soggy |
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| drainplug | (noun) a removable plug for holding water in a tub or basin | - |
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| draught | (noun) the act of moving a load by drawing or pulling | Synonyms: draft, drawing |
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| (noun) a large and hurried swallow | Synonyms: draft, gulp, swig |
| (noun) a dose of liquid medicine | Synonyms: draft |
| (noun) the depth of a vessel's keel below the surface (especially when loaded) | Synonyms: draft |
| (noun) a serving of drink (usually alcoholic) drawn from a keg | Synonyms: draft, potation, tipple |
| (noun) a current of air (usually coming into a chimney or room or vehicle) | Synonyms: draft |
| (verb) make a blueprint of | Synonyms: blueprint, draft |
| draughts | (noun) a checkerboard game for two players who each have 12 pieces; the object is to jump over and so capture the opponent's pieces | Synonyms: checkers |
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| draughtsman | (noun) a skilled worker who draws plans of buildings or machines | Synonyms: draftsman, draftsperson |
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| draughty | (adjective) not airtight | Synonyms: drafty |
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| dreadnaught | (noun) battleship that has big guns all of the same caliber | Synonyms: dreadnought |
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| dreadnought | (noun) battleship that has big guns all of the same caliber | Synonyms: dreadnaught |
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| drought | (noun) a shortage of rainfall | Synonyms: drouth |
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| (noun) a prolonged shortage | Synonyms: drouth |
| drug | (noun) a substance that is used as a medicine or narcotic | - |
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| (verb) administer a drug to | Synonyms: dose |
| (verb) use recreational drugs | Synonyms: do drugs |
| drugged | (adjective) under the influence of narcotics | Synonyms: doped, narcotised, narcotized |
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| drugget | (noun) a rug made of a coarse fabric having a cotton warp and a wool filling | - |
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| drugging | (noun) the administration of a sedative agent or drug | Synonyms: sedation |
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| druggist | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: apothecary, chemist, pharmacist, pill pusher, pill roller |
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| drugless | (adjective) without the use of drugs | - |
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| drugstore | (noun) a retail shop where medicine and other articles are sold | Synonyms: apothecary's shop, chemist's, chemist's shop, pharmacy |
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| 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 |
| earplug | (noun) a plug of cotton, wax, or rubber that is fitted into the ear canal for protection against the entry of water or loud noise | - |
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| (noun) an earphone that is inserted into the ear canal | - |
| enough | (adjective) sufficient for the purpose | Synonyms: adequate |
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| (noun) an adequate quantity; a quantity that is large enough to achieve a purpose | Synonyms: sufficiency |
| (adverb) as much as necessary | Synonyms: plenty |