| adrenal | (noun) either of a pair of complex endocrine glands situated near the kidney | Synonyms: adrenal gland, suprarenal gland |
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| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| adrenaline | (noun) a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action | Synonyms: Adrenalin, epinephrin, epinephrine |
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| adrenarche | (noun) the increase in activity of the adrenal glands just before puberty | - |
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| adrenergic | (noun) drug that has the effects of epinephrine | Synonyms: adrenergic drug |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| adrenosterone | (noun) a steroid having androgenic activity; obtained from the cortex of the adrenal gland | - |
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| adroitness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, deftness, facility, quickness |
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| ambassadress | (noun) a woman ambassador | - |
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| biquadrate | (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadratic, fourth power, quartic |
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| biquadratic | (noun) a polynomial of the fourth degree | Synonyms: biquadratic polynomial, quartic polynomial |
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| (noun) an equation of the fourth degree | Synonyms: biquadratic equation |
| (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, fourth power, quartic |
| 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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| cadre | (noun) a nucleus of military personnel capable of expansion | - |
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| (noun) a small unit serving as part of or as the nucleus of a larger political movement | Synonyms: cell |
| cefadroxil | (noun) a cephalosporin antibiotic (trade name Ultracef) | Synonyms: Ultracef |
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| escadrille | (noun) an air force squadron typically containing six airplanes (as in France during World War I) | - |
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| (noun) a small squadron | - |
| espadrille | (noun) a sandal with a sole made of rope or rubber and a cloth upper part | - |
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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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| hamadryad | (noun) large cobra of southeastern Asia and the East Indies; the largest venomous snake; sometimes placed in genus Naja | Synonyms: king cobra, Naja hannah, Ophiophagus hannah |
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| (noun) the nymph or spirit of a particular tree | - |
| headrace | (noun) a waterway that feeds water to a mill or water wheel or turbine | - |
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| headrest | (noun) a rest for the head | - |
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| (noun) a cushion attached to the top of the back of an automobile's seat to prevent whiplash | Synonyms: head restraint |
| 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 |
| hyperadrenalism | (noun) a glandular disorder caused by excessive ACTH resulting in greater than normal functioning of the adrenal gland; characterized by obesity | Synonyms: Cushing's disease |
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| hyperadrenocorticism | (noun) a glandular disorder caused by excessive cortisol | Synonyms: Cushing's syndrome |
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| hypoadrenalism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenocorticism |
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| hypoadrenocorticism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenalism |
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| madras | (noun) a light patterned cotton cloth | - |
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| madrasa | (noun) Muslim schools in Bangladesh and Pakistan | Synonyms: madrasah |
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| madrasah | (noun) Muslim schools in Bangladesh and Pakistan | Synonyms: madrasa |
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| madrepore | (noun) corals having calcareous skeletons aggregations of which form reefs and islands | Synonyms: madriporian coral, stony coral |
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| madrigal | (noun) an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form | - |
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| madrigalist | (noun) a singer of madrigals | - |
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| madrilene | (noun) a tomato-flavored consomme; often served chilled | - |
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| madrona | (noun) evergreen tree of the Pacific coast of North America having glossy leathery leaves and orange-red edible berries; wood used for furniture and bark for tanning | Synonyms: Arbutus menziesii, madrono, manzanita |
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| madrono | (noun) evergreen tree of the Pacific coast of North America having glossy leathery leaves and orange-red edible berries; wood used for furniture and bark for tanning | Synonyms: Arbutus menziesii, madrona, manzanita |
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| maladroitness | (noun) unskillfulness resulting from a lack of training | Synonyms: awkwardness, clumsiness, ineptitude, ineptness, slowness |
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| noradrenaline | (noun) a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses | Synonyms: norepinephrine |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| padre | (noun) a chaplain in one of the military services | Synonyms: Holy Joe, military chaplain, sky pilot |
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| padrone | (noun) an owner or proprietor of an inn in Italy | - |
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| (noun) an employer who exploits Italian immigrants in the U.S. | - |
| quadrangle | (noun) a rectangular area surrounded on all sides by buildings | Synonyms: quad |
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| (noun) a four-sided polygon | Synonyms: quadrilateral, tetragon |
| quadrant | (noun) a measuring instrument for measuring altitude of heavenly bodies | - |
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| (noun) the area enclosed by two perpendicular radii of a circle | - |
| (noun) any of the four areas into which a plane is divided by two orthogonal coordinate axes | - |
| (noun) a quarter of the circumference of a circle | Synonyms: quarter-circle |
| quadrantanopia | (noun) blindness in one fourth of the visual field | - |
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| quadraphony | (noun) a stereophonic sound recording or reproducing system using four separate channels | Synonyms: quadraphonic system, quadriphonic system |
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| quadrate | (noun) a square-shaped object | - |
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| (noun) a cubelike object | - |
| quadratic | (noun) a polynomial of the second degree | Synonyms: quadratic polynomial |
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| (noun) an equation in which the highest power of an unknown quantity is a square | Synonyms: quadratic equation |
| quadratics | (noun) a branch of algebra dealing with quadratic equations | - |
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| quadrature | (noun) the construction of a square having the same area as some other figure | - |
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| quadrennium | (noun) a period of four years | - |
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| quadric | (noun) a curve or surface whose equation (in Cartesian coordinates) is of the second degree | Synonyms: quadric surface |
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| quadriceps | (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quad, quadriceps femoris |
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| quadrilateral | (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
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| quadrille | (noun) a square dance of 5 or more figures for 4 or more couples | - |
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| (noun) music for dancing the quadrille | - |
| quadrillion | (noun) the number that is represented as a one followed by 15 zeros | - |
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| (noun) the number that is represented as a one followed by 24 zeros in the UK | - |
| quadrillionth | (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
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| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quadriplegic | (noun) a person who is paralyzed in both arms and both legs | - |
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| quadrivium | (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy | - |
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| quadroon | (noun) an offspring of a mulatto and a white parent; a person who is one-quarter black | - |
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| quadrumvirate | (noun) a group of four men | - |
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| quadruped | (noun) an animal especially a mammal having four limbs specialized for walking | - |
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| quadruple | (noun) a quantity that is four times as great as another | - |
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| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| quadruplet | (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quartet, quartette |
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| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quad |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| quadruplicate | (noun) any four copies; any of four things that correspond to one another exactly | - |
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| quadrupling | (noun) increase by a factor of four | - |
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| roadrunner | (noun) speedy largely terrestrial bird found from California and Mexico to Texas | Synonyms: chaparral cock, Geococcyx californianus |
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| squadron | (noun) an air force unit larger than a flight and smaller than a group | - |
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| (noun) a cavalry unit consisting of two or more troops and headquarters and supporting arms | - |
| (noun) a naval unit that is detached from the fleet for a particular task | - |