| hypothermia | (noun) subnormal body temperature | - |
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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 |
| hypothetical | (noun) a hypothetical possibility, circumstance, statement, proposal, situation, etc. | - |
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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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| ingathering | (noun) request for a sum of money | Synonyms: appeal, collection, solicitation |
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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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| kinaesthesia | (noun) the perception of body position and movement and muscular tensions etc | Synonyms: feeling of movement, kinesthesia |
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| (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesis, kinesthesia, kinesthesis, kinesthetics, muscle sense, sense of movement |
| kinaesthesis | (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesia, kinesthesia, kinesthesis, kinesthetics, muscle sense, sense of movement |
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| kinanesthesia | (noun) inability to sense movement | - |
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| kinesthesia | (noun) the perception of body position and movement and muscular tensions etc | Synonyms: feeling of movement, kinaesthesia |
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| (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesia, kinaesthesis, kinesthesis, kinesthetics, muscle sense, sense of movement |
| kinesthesis | (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesia, kinaesthesis, kinesthesia, kinesthetics, muscle sense, sense of movement |
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| kinesthetics | (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesia, kinaesthesis, kinesthesia, kinesthesis, muscle sense, sense of movement |
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| lathe | (noun) machine tool for shaping metal or wood; the workpiece turns about a horizontal axis against a fixed tool | - |
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| lathee | (noun) club consisting of a heavy stick (often bamboo) bound with iron; used by police in India | Synonyms: lathi |
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| lather | (noun) the froth produced by soaps or detergents | Synonyms: soapsuds, suds |
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| (noun) the foam resulting from excessive sweating (as on a horse) | - |
| (noun) a workman who puts up laths | - |
| (noun) agitation resulting from active worry | Synonyms: fret, stew, sweat, swither |
| leather | (noun) an animal skin made smooth and flexible by removing the hair and then tanning | - |
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| leatherback | (noun) wide-ranging marine turtle with flexible leathery carapace; largest living turtle | Synonyms: Dermochelys coriacea, leatherback turtle, leathery turtle |
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| leatherette | (noun) fabric made to look like leather | Synonyms: imitation leather |
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| leatherfish | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherjacket |
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| leatherjack | (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjacket |
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| leatherjacket | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherfish |
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| (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjack |
| (noun) tough-skinned larva of certain crane flies | - |
| leatherleaf | (noun) north temperate bog shrub with evergreen leathery leaves and small white cylindrical flowers | Synonyms: Chamaedaphne calyculata |
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| (noun) stiff leathery-leaved fern of western North America having ovate fronds parted to the midrib | Synonyms: coast polypody, leathery polypody, Polypodium scouleri |
| leatherneck | (noun) a member of the United States Marine Corps | Synonyms: devil dog, Marine, shipboard soldier |
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| leatherwood | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, moose-wood, moosewood, ropebark, wicopy |
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| (noun) shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage | Synonyms: cyrilla, Cyrilla racemiflora, white titi |
| leatherwork | (noun) work made of leather | - |
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| lengthening | (noun) the act of prolonging something | Synonyms: perpetuation, prolongation, protraction |
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| lightheadedness | (noun) a frivolous lack of prudence | - |
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| (noun) a reeling sensation; a feeling that you are about to fall | Synonyms: dizziness, giddiness, vertigo |
| lightheartedness | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, insouciance, lightsomeness |
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| litheness | (noun) the gracefulness of a person or animal that is flexible and supple | Synonyms: lissomeness, suppleness |
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| loather | (noun) one who hates or loathes | Synonyms: abominator |
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| mammothermography | (noun) the use of thermography to detect breast tumors (which appear as hot spots) | - |
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| masthead | (noun) the head or top of a mast | - |
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| (noun) the title of a newspaper or magazine; usually printed on the front page and on the editorial page | - |
| (noun) a listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc. | Synonyms: flag |
| mathematician | (noun) a person skilled in mathematics | - |
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| mathematics | (noun) a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement | Synonyms: math, maths |
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| megathere | (noun) gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in America | Synonyms: ground sloth |
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| megatherian | (noun) a large extinct ground sloth | Synonyms: megatherian mammal, megatheriid |
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| megatheriid | (noun) a large extinct ground sloth | Synonyms: megatherian, megatherian mammal |
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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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| metamathematics | (noun) the logical analysis of mathematical reasoning | - |
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| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| metathesis | (noun) a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB) | Synonyms: double decomposition, double decomposition reaction |
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| (noun) a linguistic process of transposition of sounds or syllables within a word or words within a sentence | - |
| metheglin | (noun) spiced or medicated mead | - |
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| methenamine | (noun) antibacterial agent (trade names Mandelamine and Urex) that is contained in many products that are used to treat urinary infections | Synonyms: Mandelamine, Urex |
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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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| 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 | - |
| 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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| 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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| 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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| myasthenia | (noun) a chronic progressive disease characterized by chronic fatigue and muscular weakness (especially in the face and neck); caused by a deficiency of acetylcholine at the neuromuscular junctions | Synonyms: myasthenia gravis |
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| (noun) any muscular weakness | - |
| narthex | (noun) a vestibule leading to the nave of a church | - |
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| (noun) portico at the west end of an early Christian basilica or church | - |
| netherworld | (noun) (religion) the world of the dead | Synonyms: Hades, Hell, infernal region, Scheol, underworld |
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| neurasthenia | (noun) nervous breakdown (not in technical use) | - |
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| neurasthenic | (noun) a person suffering a nervous breakdown | - |
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| neuroepithelioma | (noun) malignant tumor of the neuroepithelium | - |
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| neuroepithelium | (noun) epithelium associated with special sense organs and containing sensory nerve endings | - |
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| nightclothes | (noun) garments designed to be worn in bed | Synonyms: nightwear, sleepwear |
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| normothermia | (noun) normal body temperature | - |
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| northeast | (noun) a location in the northeastern part of a country, region, or city | - |
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| (noun) the compass point midway between north and east; at 45 degrees | Synonyms: NE, nor'-east, northeastward |
| (noun) the direction corresponding to the northeastward compass point | - |
| northeaster | (noun) a storm blowing from the northeast | Synonyms: noreaster |
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| northeastward | (noun) the compass point midway between north and east; at 45 degrees | Synonyms: NE, nor'-east, northeast |
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| norther | (noun) a wind that blows from the north | Synonyms: boreas, north wind, northerly |
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| northerly | (noun) a wind that blows from the north | Synonyms: boreas, north wind, norther |
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| northernness | (noun) the property of being to the north | - |
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| nucleosynthesis | (noun) (astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom | - |
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| 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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| 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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| overclothes | (noun) clothing for use outdoors | Synonyms: outerwear |
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| panentheism | (noun) the belief that God is in part of the universe and its phenomena and also transcends the universe and intervenes in its operations | - |
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| pantheism | (noun) the doctrine or belief that God is the universe and its phenomena (taken or conceived of as a whole) or the doctrine that regards the universe as a manifestation of God | - |
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| (noun) (rare) worship that admits or tolerates all gods | - |
| pantheist | (noun) someone who believes that God and the universe are the same | - |
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| pantheon | (noun) (antiquity) a temple to all the gods | - |
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| (noun) a monument commemorating a nation's dead heroes | - |
| (noun) all the gods of a religion | - |
| panther | (noun) a leopard in the black color phase | - |
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| (noun) a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis | Synonyms: Felis onca, jaguar, Panthera onca |
| (noun) large American feline resembling a lion | Synonyms: catamount, cougar, Felis concolor, mountain lion, painter, puma |
| 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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| paraesthesia | (noun) abnormal skin sensations (as tingling or tickling or itching or burning) usually associated with peripheral nerve damage | Synonyms: paresthesia |
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| parasympathetic | (noun) originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels | Synonyms: parasympathetic nervous system |
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| parenthesis | (noun) either of two punctuation marks (or) used to enclose textual material | - |
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| (noun) a message that departs from the main subject | Synonyms: aside, digression, divagation, excursus |
| parenthetical | (noun) an expression in parentheses | Synonyms: parenthetical expression |
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| paresthesia | (noun) abnormal skin sensations (as tingling or tickling or itching or burning) usually associated with peripheral nerve damage | Synonyms: paraesthesia |
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| parthenocarpy | (noun) (botany) the development of a fruit without fertilization or seeds | - |
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| parthenogenesis | (noun) process in which an unfertilized egg develops into a new individual; common among insects and some other arthropods | Synonyms: parthenogeny |
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| (noun) human conception without fertilization by a man | Synonyms: parthenogeny, virgin birth |
| parthenogeny | (noun) process in which an unfertilized egg develops into a new individual; common among insects and some other arthropods | Synonyms: parthenogenesis |
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| (noun) human conception without fertilization by a man | Synonyms: parthenogenesis, virgin birth |
| parthenote | (noun) a cell resulting from parthenogenesis | - |
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| perithecium | (noun) flask-shaped ascocarp | - |
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| perithelium | (noun) tissue layer around small blood vessels | - |
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| photosynthesis | (noun) synthesis of compounds with the aid of radiant energy (especially in plants) | - |
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| phototherapy | (noun) the use of strong light to treat acne or hyperbilirubinemia of the newborn | - |
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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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| pithead | (noun) the entrance to a coal mine | - |
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| plainclothesman | (noun) a detective who wears civilian clothes on duty | - |
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