| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| dendrology | (noun) the study of wooden plants | - |
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| dewdrop | (noun) a drop of dew | - |
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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 | - |
| 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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| eardrop | (noun) an earring with a pendant ornament | Synonyms: drop earring, pendant earring |
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| eavesdropper | (noun) a secret listener to private conversations | - |
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| enchondroma | (noun) benign slow-growing tumor of cartilaginous cells at the ends of tubular bones (especially in the hands and feet) | - |
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| epidendron | (noun) any of various orchids of the genus Epidendrum | - |
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| eyedrop | (noun) a method of irrigating the eye used by ophthalmologists | Synonyms: eye-drop |
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| (noun) a drop from an eye dropper | Synonyms: eye-drop |
| guardroom | (noun) a room used by soldiers on guard | - |
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| (noun) a cell in which soldiers who are prisoners are confined | - |
| gumdrop | (noun) a jellied candy coated with sugar crystals | - |
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| gynandromorph | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene, epicene person, hermaphrodite, intersex |
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| hadron | (noun) any elementary particle that interacts strongly with other particles | - |
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| hadrosaur | (noun) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic | Synonyms: duck-billed dinosaur, hadrosaurus |
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| hadrosaurus | (noun) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic | Synonyms: duck-billed dinosaur, hadrosaur |
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| headroom | (noun) the capacity of a system to reproduce loud sounds without distortion | Synonyms: dynamic headroom |
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| (noun) vertical space available to allow easy passage under something | Synonyms: clearance, headway |
| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hidrosis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: diaphoresis, perspiration, sudation, sweating |
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| hippodrome | (noun) a stadium for horse shows or horse races | - |
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| hydrocarbon | (noun) an organic compound containing only carbon and hydrogen | - |
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| hydrocele | (noun) disorder in which serous fluid accumulates in a body sac (especially in the scrotum) | - |
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| hydrocephalus | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephaly |
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| hydrocephaly | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephalus |
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| hydrochloride | (noun) a complex consisting of an organic base in association with hydrogen chloride | - |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrochlorothiazide | (noun) a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension | Synonyms: Esidrix, HydroDIURIL, Microzide |
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| hydrocolloid | (noun) a substance that forms a gel with water | - |
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| hydrocortisone | (noun) an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism | Synonyms: Cortef, cortisol, Hydrocortone |
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| hydrocracking | (noun) the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst | - |
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| hydrodynamics | (noun) study of fluids in motion | Synonyms: hydrokinetics |
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