| drogue | (noun) a parachute used to decelerate an object that is moving rapidly | Synonyms: drogue chute, drogue parachute |
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| (noun) restraint consisting of a canvas covered frame that floats behind a vessel; prevents drifting or maintains the heading into a wind | Synonyms: sea anchor |
| (noun) a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind | Synonyms: air-sleeve, air sock, sock, wind cone, wind sleeve, wind sock, windsock |
| (noun) a funnel-shaped device towed as a target by an airplane | - |
| droll | (adjective) comical in an odd or whimsical manner | - |
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| drollery | (noun) a quaint and amusing jest | Synonyms: waggery |
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| (noun) a comic incident or series of incidents | Synonyms: clowning, comedy, funniness |
| dromaeosaur | (noun) a kind of maniraptor | - |
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| drome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airdrome, airport |
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| dromedary | (noun) one-humped camel of the hot deserts of northern Africa and southwestern Asia | Synonyms: Arabian camel, Camelus dromedarius |
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| dronabinol | (noun) psychoactive substance present in marijuana; used therapeutically to control nausea associated with cancer therapy | - |
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| drone | (noun) stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen | - |
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| (noun) a pipe of the bagpipe that is tuned to produce a single continuous tone | Synonyms: bourdon, drone pipe |
| (noun) an aircraft without a pilot that is operated by remote control | Synonyms: pilotless aircraft, radio-controlled aircraft |
| (noun) an unchanging intonation | Synonyms: droning, monotone |
| (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, laggard, lagger, poke, trailer |
| (verb) talk in a monotonous voice | Synonyms: drone on |
| (verb) make a monotonous low dull sound | - |
| droning | (noun) an unchanging intonation | Synonyms: drone, monotone |
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| drool | (noun) saliva spilling from the mouth | Synonyms: dribble, drivel, slobber |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
| (verb) let saliva drivel from the mouth | Synonyms: dribble, drivel, slabber, slaver, slobber |
| (verb) be envious, desirous, eager for, or extremely happy about something | Synonyms: salivate |
| drooler | (noun) a person who dribbles | Synonyms: dribbler, driveller, slobberer |
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| droop | (noun) a shape that sags | Synonyms: sag |
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| (verb) become limp | Synonyms: wilt |
| (verb) droop, sink, or settle from or as if from pressure or loss of tautness | Synonyms: flag, sag, swag |
| (verb) hang loosely or laxly | Synonyms: loll |
| drooping | (adjective) hanging down (as from exhaustion or weakness) | Synonyms: droopy, sagging |
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| (adjective) weak from exhaustion | Synonyms: flagging |
| (adjective) having branches or flower heads that bend downward | Synonyms: cernuous, nodding, pendulous, weeping |
| droopingly | (adverb) in a drooping manner | - |
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| droopy | (adjective) hanging down (as from exhaustion or weakness) | Synonyms: drooping, sagging |
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| drop | (noun) the act of dropping something | - |
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| (noun) a central depository where things can be left or picked up | - |
| (noun) a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery | Synonyms: drop cloth, drop curtain |
| (noun) a sudden sharp decrease in some quantity | Synonyms: dip, fall, free fall |
| (noun) a free and rapid descent by the force of gravity | Synonyms: fall |
| (noun) a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property) | - |
| (noun) a steep high face of rock | Synonyms: cliff, drop-off |
| (noun) a small indefinite quantity (especially of a liquid) | Synonyms: drib, driblet |
| (noun) a shape that is spherical and small | Synonyms: bead, pearl |
| (verb) give birth; used for animals | - |
| (verb) grow progressively worse | Synonyms: degenerate, deteriorate, devolve |
| (verb) go down in value | - |
| (verb) stop pursuing or acting | Synonyms: knock off |
| (verb) change from one level to another | - |
| (verb) lower the pitch of (musical notes) | Synonyms: flatten |
| (verb) fall or sink into a state of exhaustion or death | - |
| (verb) leave undone or leave out | Synonyms: leave out, miss, neglect, omit, overleap, overlook, pretermit |
| (verb) omit (a letter or syllable) in speaking or writing | - |
| (verb) utter with seeming casualness | - |
| (verb) lose (a game) | - |
| (verb) take (a drug, especially LSD), by mouth | - |
| (verb) remove (cargo, people, etc.) from and leave | Synonyms: discharge, drop off, put down, set down, unload |
| (verb) to remove | Synonyms: cast, cast off, shake off, shed, throw, throw away, throw off |
| (verb) cause to fall by or as if by delivering a blow | Synonyms: cut down, fell, strike down |
| (verb) let or cause to fall in drops | Synonyms: dribble, drip |
| (verb) to fall vertically | - |
| (verb) let fall to the ground | - |
| (verb) fall or descend to a lower place or level | Synonyms: drop down, sink |
| (verb) pay out | Synonyms: expend, spend |
| (verb) stop associating with | Synonyms: dismiss, send away, send packing |
| (verb) terminate an association with | - |
| (verb) hang loosely | Synonyms: dangle, swing |
| dropforge | (verb) forge with a dropforge | - |
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| dropkick | (noun) (football) kicking (as for a field goal) in which the football is dropped and kicked as it touches the ground | - |
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| (verb) make the point after a touchdown with a dropkick | Synonyms: drop-kick |
| (verb) drop and kick (a ball) as it touches the ground, as for a field goal | Synonyms: drop-kick |
| dropkicker | (noun) a football kicker who drops the ball and kicks it just as it reaches the ground | - |
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| droplet | (noun) a tiny drop | - |
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| dropline | (noun) a headline with the top line flush left and succeeding lines indented to the right | Synonyms: drop line, stagger head, staggered head, stephead, stepped line |
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| dropout | (noun) someone who quits school before graduation | - |
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| (noun) someone who withdraws from a social group or environment | - |
| dropper | (noun) pipet consisting of a small tube with a vacuum bulb at one end for drawing liquid in and releasing it a drop at a time | Synonyms: eye dropper |
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| dropping | (adjective) coming down freely under the influence of gravity | Synonyms: falling |
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| droppings | (noun) fecal matter of animals | Synonyms: dung, muck |
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| dropseed | (noun) a grass of the genus Sporobolus | Synonyms: drop-seed |
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| dropsical | (adjective) swollen with an excessive accumulation of fluid | Synonyms: edematous |
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| dropsy | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: edema, hydrops, oedema |
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| droshky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: drosky |
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| drosky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: droshky |
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| drosophila | (noun) small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance | Synonyms: Drosophila melanogaster |
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| dross | (noun) the scum formed by oxidation at the surface of molten metals | Synonyms: scoria, slag |
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| (noun) worthless or dangerous material that should be removed | Synonyms: impurity |
| drought | (noun) a shortage of rainfall | Synonyms: drouth |
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| (noun) a prolonged shortage | Synonyms: drouth |
| drouth | (noun) a shortage of rainfall | Synonyms: drought |
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| (noun) a prolonged shortage | Synonyms: drought |
| drove | (noun) a stonemason's chisel with a broad edge for dressing stone | Synonyms: drove chisel |
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| (noun) a group of animals (a herd or flock) moving together | - |
| (noun) a moving crowd | Synonyms: horde, swarm |
| drover | (noun) someone who drives a herd | Synonyms: herder, herdsman |
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| drown | (verb) die from being submerged in water, getting water into the lungs, and asphyxiating | - |
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| (verb) kill by submerging in water | - |
| (verb) get rid of as if by submerging | - |
| (verb) cover completely or make imperceptible | Synonyms: overwhelm, submerge |
| (verb) be in danger of dying from submersion in a liquid and asphyxiation | - |
| (verb) be covered with or submerged in a liquid | Synonyms: swim |
| drowse | (noun) a light fitful sleep | Synonyms: doze |
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| (verb) be on the verge of sleeping | - |
| (verb) sleep lightly or for a short period of time | Synonyms: doze, snooze |
| drowsily | (adverb) in a drowsy manner | Synonyms: somnolently |
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| drowsiness | (noun) a very sleepy state | Synonyms: sleepiness, somnolence |
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| drowsing | (adjective) half asleep | Synonyms: dozy, drowsy |
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| drowsy | (adjective) half asleep | Synonyms: dozy, drowsing |
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| (adjective) showing lack of attention or boredom | Synonyms: oscitant, yawning |