| 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 | - |
| 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 |
| 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 |
| 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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| 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 |
| 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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| 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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| 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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| 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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| drowse | (noun) a light fitful sleep | Synonyms: doze |
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| drowsiness | (noun) a very sleepy state | Synonyms: sleepiness, somnolence |
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