| halothane | (noun) a nonflammable inhalation anesthetic that produces general anesthesia; used along with analgesics and muscle relaxants for many types of surgical procedures | - |
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| hawkmoth | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hummingbird moth, sphingid, sphinx moth |
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| heliotherapy | (noun) therapeutic exposure to sunlight | Synonyms: insolation |
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| hemothorax | (noun) accumulation of blood in the pleural cavity (the space between the lungs and the walls of the chest) | Synonyms: haemothorax |
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| heterothermic | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, poikilothermic, poikilothermous |
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| holothurian | (noun) echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders | Synonyms: sea cucumber |
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| homeotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homoiotherm, homotherm |
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| homeothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homoiothermic, homothermic |
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| homoiotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homotherm |
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| homoiothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homothermic |
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| homothecy | (noun) (mathematics) an isotropic scaling transformation of an affine space with a single fixed point. | Synonyms: homothety |
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| homotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homoiotherm |
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| homothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homoiothermic |
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| homothety | (noun) (mathematics) an isotropic scaling transformation of an affine space with a single fixed point. | Synonyms: homothecy |
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| horsecloth | (noun) a cloth for the trapping of a horse | - |
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| hothead | (noun) a reckless impetuous irresponsible person | Synonyms: daredevil, harum-scarum, lunatic, madcap, swashbuckler |
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| (noun) a belligerent grouch | Synonyms: fire-eater |
| hotheaded | (adjective) quickly aroused to anger | Synonyms: choleric, hot-tempered, irascible, quick-tempered, short-tempered |
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| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, impetuous, impulsive, madcap, tearaway |
| hothouse | (noun) a greenhouse in which plants are arranged in a pleasing manner | Synonyms: conservatory, indoor garden |
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| housemother | (noun) a woman employed as a chaperon in a residence for young people | - |
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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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| hydrotherapy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydropathy |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| hypnotherapy | (noun) the use of hypnosis in psychotherapy | - |
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| hypothalamic | (adjective) of or relating to the hypothalamus | - |
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| hypothalamically | (adverb) with respect to the hypothalamus | - |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| hypothecate | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothesise, hypothesize, speculate, suppose, theorise, theorize |
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| (verb) pledge without delivery or title of possession | - |
| hypothermia | (noun) subnormal body temperature | - |
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| hypothermic | (adjective) of or relating to or affected by hypothermia | - |
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| hypothesis | (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | Synonyms: possibility, theory |
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| (noun) a proposal intended to explain certain facts or observations | - |
| (noun) a message expressing an opinion based on incomplete evidence | Synonyms: conjecture, guess, speculation, supposition, surmisal, surmise |
| hypothesise | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothecate, hypothesize, speculate, suppose, theorise, theorize |
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| hypothesize | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothecate, hypothesise, speculate, suppose, theorise, theorize |
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| hypothetic | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetical, supposed, suppositional, suppositious, supposititious |
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| hypothetical | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, supposed, suppositional, suppositious, supposititious |
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| (noun) a hypothetical possibility, circumstance, statement, proposal, situation, etc. | - |
| hypothetically | (adverb) by hypothesis | - |
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| hypothrombinemia | (noun) a low level of prothrombin (factor II) in the circulating blood; results in long clotting time and poor clot formation and sometimes excessive bleeding; can result from vitamin K deficiency | - |
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| hypothyroidism | (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones | - |
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| immunotherapeutic | (adjective) of or relating to immunotherapy | - |
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| immunotherapy | (noun) therapy designed to produce immunity to a disease or to enhance resistance by the immune system | - |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iontotherapy | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontophoresis |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isothere | (noun) a line on a map linking places with the same mean summer temperature. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| isothermal | (adjective) of a process or change taking place at constant temperature | - |
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| isothermic | (adjective) of or relating to an isotherm | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| knothole | (noun) a hole in a board where a knot came out | - |
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| leucothoe | (noun) any plant of the genus Leucothoe; grown for their beautiful white flowers; glossy foliage contains a poisonous substance similar to that found in genus Kalmia | - |
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| liothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: T, triiodothyronine |
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| loincloth | (noun) a garment that provides covering for the loins | Synonyms: breechcloth, breechclout |
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| loth | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetic, antipathetical, averse, indisposed, loath |
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| (adjective) unwillingness to do something contrary to your custom | Synonyms: loath, reluctant |
| mammoth | (adjective) so exceedingly large or extensive as to suggest a giant or mammoth | Synonyms: gigantic |
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| (noun) any of numerous extinct elephants widely distributed in the Pleistocene; extremely large with hairy coats and long upcurved tusks | - |
| mammothermography | (noun) the use of thermography to detect breast tumors (which appear as hot spots) | - |
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| mesothelioma | (noun) a form of carcinoma of the mesothelium lining lungs or abdomen or heart; usually associated with exposure to asbestos dust | - |
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| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| monotheism | (noun) belief in a single God | - |
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| monotheist | (noun) a believer in one god | - |
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| monotheistic | (adjective) believing that there is only one god | - |
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| moth | (noun) typically crepuscular or nocturnal insect having a stout body and feathery or hairlike antennae | - |
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| mothball | (noun) a small sphere of camphor or naphthalene used to keep moths away from stored clothing | Synonyms: camphor ball |
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| (verb) put into long-term storage | - |
| mother | (noun) a condition that is the inspiration for an activity or situation | - |
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| (noun) a woman who has given birth to a child (also used as a term of address to your mother) | Synonyms: female parent |
| (noun) a term of address for a mother superior | - |
| (noun) a term of address for an elderly woman | - |
| (noun) a stringy slimy substance consisting of yeast cells and bacteria; forms during fermentation and is added to cider or wine to produce vinegar | - |
| (verb) make (offspring) by reproduction | Synonyms: beget, bring forth, engender, father, generate, get, sire |
| (verb) care for like a mother | Synonyms: fuss, overprotect |
| motherese | (noun) an adult's imitation of the speech of a young child | Synonyms: baby talk, babytalk |
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| motherfucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, cocksucker, dickhead, mother fucker, prick, shit, SOB, son of a bitch, whoreson |
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| motherhood | (noun) the kinship relation between an offspring and the mother | Synonyms: maternity |
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| motherland | (noun) the country where you were born | Synonyms: country of origin, fatherland, homeland, mother country, native land |
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| motherless | (adjective) having no living or known mother | - |
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| motherlike | (adjective) suggestive of or acting like a mother | - |
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| motherliness | (noun) the quality of having or showing the tenderness and warmth and affection of or befitting a mother | Synonyms: maternal quality, maternalism, maternity |
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| motherly | (adjective) befitting a mother; warm and nurturing | - |
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| (adverb) in a maternal manner; as a mother | Synonyms: maternally |
| motherwort | (noun) bitter Old World herb of hedgerows and woodland margins having toothed leaves and white or pale pink flowers | Synonyms: Leonurus cardiaca |
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| mothproof | (adjective) resistant to damage by moths | Synonyms: moth-resistant |
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| (verb) protect from moths | - |
| mothy | (adjective) infested with moths | - |
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| (adjective) worn or eaten away by (or as if by) moths | Synonyms: moth-eaten |
| neckcloth | (noun) an ornamental white cravat | Synonyms: stock |
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| nightclothes | (noun) garments designed to be worn in bed | Synonyms: nightwear, sleepwear |
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| nomothetic | (adjective) relating to or involving the search for abstract universal principles | - |
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| normothermia | (noun) normal body temperature | - |
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| nothing | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, null, zero, zilch, zip, zippo |
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| (adverb) in no respect; to no degree | - |
| nothingness | (noun) empty rhetoric or insincere or exaggerated talk | Synonyms: idle words, jazz, malarkey, malarky, wind |
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| (noun) the state of nonexistence | Synonyms: nihility, nullity, void |
| nothings | (noun) inconsequential conversation | - |
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| nothosaur | (noun) extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming | - |
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| oilcloth | (noun) cloth treated on one side with a drying oil or synthetic resin | - |
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| other | (adjective) not the same one or ones already mentioned or implied; quantifier, other | - |
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| (adjective) recently past | - |
| (adjective) very unusual; different in character or quality from the normal or expected | - |
| (adjective) belonging to the distant past | Synonyms: early, former |
| otherness | (noun) the quality of being not alike; being distinct or different from that otherwise experienced or known | Synonyms: distinctness, separateness |
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| otherwise | (adjective) other than as supposed or expected | - |
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| (adverb) in other respects or ways | - |
| (adverb) in another and different manner | Synonyms: differently |
| otherworld | (noun) an abstract spiritual world beyond earthly reality | - |
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| otherworldliness | (noun) concern with things of the spirit | Synonyms: spiritism, spiritualism, spirituality |
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| otherworldly | (adjective) existing outside of or not in accordance with nature | Synonyms: nonnatural, preternatural, transcendental |
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| othonna | (noun) a South African plant of the genus Othonna having smooth often fleshy leaves and heads of yellow flowers | - |
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| overclothe | (verb) dress too warmly | Synonyms: overdress |
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| overclothes | (noun) clothing for use outdoors | Synonyms: outerwear |
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| pantothen | (noun) a vitamin of the vitamin B complex that performs an important role in the oxidation of fats and carbohydrates and certain amino acids; occurs in many foods | Synonyms: pantothenic acid |
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| phenothiazine | (noun) a compound used primarily in veterinary medicine to rid farm animals of internal parasites | Synonyms: thiodiphenylamine |
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| phlebothrombosis | (noun) thrombosis of a vein without prior inflammation of the vein; associated with sluggish blood flow (as in prolonged bedrest or pregnancy or surgery) or with rapid coagulation of the blood | Synonyms: venous thrombosis |
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| phototherapy | (noun) the use of strong light to treat acne or hyperbilirubinemia of the newborn | - |
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| physiotherapeutic | (adjective) of or relating to or used in physical therapy | - |
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| physiotherapist | (noun) therapist who treats injury or dysfunction with exercises and other physical treatments of the disorder | Synonyms: physical therapist |
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| physiotherapy | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physiatrics, physical therapy |
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| phytotherapy | (noun) the use of plants or plant extracts for medicinal purposes (especially plants that are not part of the normal diet) | Synonyms: botanical medicine, herbal therapy |
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| pilothouse | (noun) an enclosed compartment from which a vessel can be navigated | Synonyms: wheelhouse |
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