| hydroxyzine | (noun) a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness | Synonyms: Atarax, hydroxyzine hydrochloride, Vistaril |
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| hydrozoan | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydroid |
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| 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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| hyperhidrosis | (noun) excessive and profuse perspiration | Synonyms: hyperidrosis, polyhidrosis |
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| hyperidrosis | (noun) excessive and profuse perspiration | Synonyms: hyperhidrosis, polyhidrosis |
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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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| hypochondria | (noun) chronic and abnormal anxiety about imaginary symptoms and ailments | Synonyms: hypochondriasis |
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| hypochondriac | (noun) a patient with imaginary symptoms and ailments | - |
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| hypochondriasis | (noun) chronic and abnormal anxiety about imaginary symptoms and ailments | Synonyms: hypochondria |
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| hypochondrium | (noun) the upper region of the abdomen just below the lowest ribs on either side of the epigastrium | - |
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| icosahedron | (noun) any polyhedron having twenty plane faces | - |
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| indri | (noun) large short-tailed lemur of Madagascar having thick silky fur in black and white and fawn | Synonyms: Indri brevicaudatus, Indri indri, indris |
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| indris | (noun) large short-tailed lemur of Madagascar having thick silky fur in black and white and fawn | Synonyms: indri, Indri brevicaudatus, Indri indri |
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| iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| kindred | (noun) group of people related by blood or marriage | Synonyms: clan, kin, kin group, kinship group, tribe |
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| landrover | (noun) a car suitable for traveling over rough terrain | Synonyms: jeep |
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| laundress | (noun) a working woman who takes in washing | Synonyms: laundrywoman, washerwoman, washwoman |
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| laundry | (noun) workplace where clothes are washed and ironed | - |
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| (noun) garments or white goods that can be cleaned by laundering | Synonyms: wash, washables, washing |
| laundryman | (noun) a man who operates an industrial washing machine | Synonyms: washerman |
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| laundrywoman | (noun) a working woman who takes in washing | Synonyms: laundress, washerwoman, washwoman |
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| linendraper | (noun) a retail dealer in yard goods | - |
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| lipochondrodystrophy | (noun) hereditary disease (autosomal recessive) consisting of an error is mucopolysaccharide metabolism; characterized by severe abnormalities in development of skeletal cartilage and bone and mental retardation | Synonyms: dysostosis multiplex, gargoylism, Hurler's disease, Hurler's syndrome |
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| loxodrome | (noun) a line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction | Synonyms: rhumb, rhumb line |
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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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| magnetohydrodynamics | (noun) the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal) | - |
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| maildrop | (noun) a drop where mail can be deposited | - |
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| maladroitness | (noun) unskillfulness resulting from a lack of training | Synonyms: awkwardness, clumsiness, ineptitude, ineptness, slowness |
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| mandrake | (noun) a plant of southern Europe and North Africa having purple flowers, yellow fruits and a forked root formerly thought to have magical powers | Synonyms: devil's apples, Mandragora officinarum |
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| (noun) the root of the mandrake plant; used medicinally or as a narcotic | Synonyms: mandrake root |
| mandrel | (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: arbor, mandril, spindle |
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| mandril | (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: arbor, mandrel, spindle |
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| mandrill | (noun) baboon of west Africa with a bright red and blue muzzle and blue hindquarters | Synonyms: Mandrillus sphinx |
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| matsyendra | (noun) (Hinduism) a religious posture | - |
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| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| melodrama | (noun) an extravagant comedy in which action is more salient than characterization | - |
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| midrib | (noun) the vein in the center of a leaf | Synonyms: midvein |
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| midriff | (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: diaphragm |
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| (noun) the middle area of the human torso (usually in front) | Synonyms: middle, midsection |
| mitochondrion | (noun) an organelle containing enzymes responsible for producing energy | Synonyms: chondriosome |
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| monandry | (noun) the state of having only one husband at a time | - |
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| monohydrate | (noun) a hydrate that contains one molecule of water per molecule of the compound | - |
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| mudra | (noun) ritual hand movement in religion or religious dancing, particularly in Hinduism or Buddhism | - |
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| mydriasis | (noun) reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs | - |
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| mydriatic | (noun) a drug that causes the pupil of the eye to dilate; used to aid eye examinations | Synonyms: mydriatic drug |
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| mysoandry | (noun) hatred for men or boys | - |
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| nandrolone | (noun) an androgen (trade names Durabolin or Kabolin) that is used to treat testosterone deficiency or breast cancer or osteoporosis | Synonyms: Durabolin, Kabolin |
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| nightdress | (noun) lingerie consisting of a loose dress designed to be worn in bed by women | Synonyms: gown, night-robe, nightgown, nightie |
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| nondrinker | (noun) a person who refrains from drinking intoxicating beverages | Synonyms: abstainer, abstinent |
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| nondriver | (noun) a person who is not a driver | - |
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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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| norethandrolone | (noun) a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis | Synonyms: norethindrone, norethindrone acetate, Norlutin |
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| norethindrone | (noun) a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis | Synonyms: norethandrolone, norethindrone acetate, Norlutin |
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| norethynodrel | (noun) a progesterone derivative used in oral contraceptives and in the control of menstruation and the treatment of abnormal uterine bleeding | - |
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| octahedron | (noun) any polyhedron having eight plane faces | - |
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| oligodendria | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendroglia |
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| oligodendrocyte | (noun) a cell of the oligodendroglia | - |
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| oligodendroglia | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendria |
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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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| osteochondroma | (noun) benign tumor containing both bone and cartilage; usually occurs near the end of a long bone | - |
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| overdraft | (noun) a draft in excess of the credit balance | - |
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| overdrive | (noun) a high gear used at high speeds to maintain the driving speed with less output power | - |
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| (noun) the state of high or excessive activity or productivity or concentration | - |
| pachysandra | (noun) any plant of the genus Pachysandra; low-growing evergreen herbs or subshrubs having dentate leaves and used as ground cover | - |
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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. | - |
| palaeodendrology | (noun) the branch of paleobotany that studies fossil trees | Synonyms: paleodendrology |
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| paleodendrology | (noun) the branch of paleobotany that studies fossil trees | Synonyms: palaeodendrology |
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| palindrome | (noun) a word or phrase that reads the same backward as forward | - |
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| panjandrum | (noun) an important or influential (and often overbearing) person | Synonyms: dignitary, high-up, high muckamuck, very important person, VIP |
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| pendragon | (noun) the supreme war chief of the ancient Britons | - |
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| pentahedron | (noun) any polyhedron having five plane faces | - |
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| philodendron | (noun) often grown as a houseplant | - |
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| polyandrist | (noun) a woman with two or more husbands | - |
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| polyandry | (noun) the state of having more than one husband at a time | - |
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| polyhedron | (noun) a solid figure bounded by plane polygons or faces | - |
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| polyhidrosis | (noun) excessive and profuse perspiration | Synonyms: hyperhidrosis, hyperidrosis |
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| poudrin | (noun) small crystals of ice | Synonyms: diamond dust, frost mist, frost snow, ice crystal, ice needle, snow mist |
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| prodroma | (noun) an early symptom that a disease is developing or that an attack is about to occur | Synonyms: prodrome |
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| prodrome | (noun) an early symptom that a disease is developing or that an attack is about to occur | Synonyms: prodroma |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| 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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