| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplastic | (adjective) of or relating to achondroplasia | - |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| adroit | (adjective) quick or skillful or adept in action or thought | - |
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| adroitly | (adverb) with adroitness; in an adroit manner | - |
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| adroitness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, deftness, facility, quickness |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| airdrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airport, drome |
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| airdrop | (noun) delivery of supplies or equipment or personnel by dropping them by parachute from an aircraft | - |
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| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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| androecium | (noun) a male gametoecium | - |
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| androgen | (noun) male sex hormone that is produced in the testes and responsible for typical male sexual characteristics | Synonyms: androgenic hormone |
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| androgenesis | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgeny |
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| androgenetic | (adjective) of or related to androgenesis | Synonyms: androgenous |
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| androgenic | (adjective) of or related to the male hormone androgen | - |
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| androgenous | (adjective) of or related to androgenesis | Synonyms: androgenetic |
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| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
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| androglossia | (noun) a woman's voice with male qualities | - |
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| androgyne | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: epicene, epicene person, gynandromorph, hermaphrodite, intersex |
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| androgynous | (adjective) having both male and female characteristics | - |
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| (adjective) relating to or exhibiting both female and male sex organs but with a predominantly female appearance | - |
| androgyny | (noun) showing characteristics of both sexes | Synonyms: bisexuality, hermaphroditism |
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| android | (noun) an automaton that resembles a human being | Synonyms: humanoid, mechanical man |
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| (noun) An operating system from Google for mobile devices | - |
| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
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| (noun) broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers | Synonyms: Japanese andromeda, lily-of-the-valley tree, Pieris japonica |
| androphobia | (noun) a morbid fear of men | - |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| anhidrosis | (noun) failure of the sweat glands | Synonyms: anhydrosis |
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| anhydrosis | (noun) failure of the sweat glands | Synonyms: anhidrosis |
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| anhydrous | (adjective) without water; especially without water of crystallization | - |
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| antidromic | (adjective) conducting nerve impulses in a direction opposite to normal | - |
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| backdrop | (noun) scenery hung at back of stage | Synonyms: backcloth, background |
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| bedrock | (noun) principles from which other truths can be derived | Synonyms: basic principle, basics, fundamental principle, fundamentals |
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| (noun) solid unweathered rock lying beneath surface deposits of soil | - |
| bedroll | (noun) bedding rolled up for carrying | - |
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| bedroom | (noun) a room used primarily for sleeping | Synonyms: bedchamber, chamber, sleeping accommodation, sleeping room |
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| bloodroot | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: puccoon, redroot, Sanguinaria canadensis, tetterwort |
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| boardroom | (noun) a room where a committee meets (such as the board of directors of a company) | Synonyms: council chamber |
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| breadroot | (noun) densely hairy perennial of central North America having edible tuberous roots | Synonyms: Indian breadroot, pomme blanche, pomme de prairie, Psoralea esculenta |
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| caldron | (noun) a very large pot that is used for boiling | Synonyms: cauldron |
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| cardroom | (noun) a room for gambling on card games | - |
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| catadromous | (adjective) migrating from fresh water to the sea to spawn | - |
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| cauldron | (noun) a very large pot that is used for boiling | Synonyms: caldron |
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| cefadroxil | (noun) a cephalosporin antibiotic (trade name Ultracef) | Synonyms: Ultracef |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chondrodystrophy | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, achondroplasty, osteosclerosis congenita |
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| chondroma | (noun) a common benign tumor of cartilage cells | - |
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| chondrosarcoma | (noun) a malignant neoplasm of cartilage cells | - |
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| decahedron | (noun) any polyhedron having ten plane faces | - |
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| dehydrogenate | (verb) remove hydrogen from | - |
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| dehydroretinol | (noun) a viscous alcohol that is less active in mammals than is vitamin A1 | Synonyms: vitamin A2 |
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| dendrobium | (noun) a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers | - |
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| dendroid | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroidal, tree-shaped, treelike |
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| dendroidal | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, tree-shaped, treelike |
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| dendrology | (noun) the study of wooden plants | - |
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| dewdrop | (noun) a drop of dew | - |
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| diadromous | (adjective) (used of fish) migratory between fresh and salt waters | - |
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| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| dihydroxyphenylalanine | (noun) amino acid that is formed in the liver and converted into dopamine in the brain | Synonyms: dopa |
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| dodecahedron | (noun) any polyhedron having twelve plane faces | - |
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| 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 |