| laryngotracheobronchitis | (noun) inflammation of the larynx and trachea and bronchial passageways | - |
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| leitmotif | (noun) a melodic phrase that accompanies the reappearance of a person or situation (as in Wagner's operas) | Synonyms: leitmotiv |
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| leitmotiv | (noun) a melodic phrase that accompanies the reappearance of a person or situation (as in Wagner's operas) | Synonyms: leitmotif |
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| leotard | (noun) a tight-fitting garment of stretchy material that covers the body from the shoulders to the thighs (and may have long sleeves or legs reaching down to the ankles); worn by ballet dancers and acrobats for practice or performance | Synonyms: body suit, cat suit, unitard |
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| leotards | (noun) skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls | Synonyms: tights |
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| lepidobotrys | (noun) African tree often classified in other families; similar to the Costa Rican caracolito in wood structure as well as in fruit and flowers and leaves and seeds | - |
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| lepiota | (noun) any fungus of the genus Lepiota | - |
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| leptotene | (noun) the first stage of the prophase of meiosis | - |
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| lerot | (noun) dormouse of southern Europe and northern Africa | - |
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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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| leucotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leukotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| leukotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| levorotation | (noun) rotation to the left | Synonyms: counterclockwise rotation |
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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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| lipoprotein | (noun) a conjugated protein having a lipid component; the principal means for transporting lipids in the blood | - |
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| lithotomy | (noun) surgical removal of a stone (calculus) | - |
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| litotes | (noun) understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary) | Synonyms: meiosis |
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| lobotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, leukotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| locomotion | (noun) self-propelled movement | Synonyms: travel |
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| (noun) the power or ability to move | Synonyms: motive power, motivity |
| locomotive | (noun) a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks | Synonyms: engine, locomotive engine, railway locomotive |
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| logotype | (noun) a company emblem or device | Synonyms: logo |
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| loincloth | (noun) a garment that provides covering for the loins | Synonyms: breechcloth, breechclout |
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| longroot | (noun) deep-rooted perennial of southeastern United States | Synonyms: Arenaria caroliniana, pine-barren sandwort |
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| longshot | (noun) a photograph taken from a distance | - |
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| loot | (noun) goods or money obtained illegally | Synonyms: booty, dirty money, pillage, plunder, prize, swag |
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| (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, dough, gelt, kale, lettuce, lolly, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| looter | (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, pillager, plunderer, raider, spoiler |
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| looting | (noun) plundering during riots or in wartime | Synonyms: robbery |
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| lot | (noun) anything (straws or pebbles etc.) taken or chosen at random | Synonyms: draw |
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| (noun) an unofficial association of people or groups | Synonyms: band, circle, set |
| (noun) any collection in its entirety | Synonyms: bunch, caboodle |
| (noun) a parcel of land having fixed boundaries | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: circumstances, destiny, fate, fortune, luck, portion |
| lota | (noun) a globular water bottle used in Asia | - |
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| loti | (noun) the basic unit of money in Lesotho | - |
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| lotion | (noun) any of various cosmetic preparations that are applied to the skin | - |
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| (noun) liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin | Synonyms: application |
| lots | (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, oodles, piles, rafts, scads, scores, slews, stacks, tons, wads |
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| lotte | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, anglerfish, goosefish, Lophius Americanus, monkfish |
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| lottery | (noun) players buy (or are given) chances and prizes are distributed by casting lots | Synonyms: drawing |
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| (noun) something that is regarded as a chance event | - |
| lotto | (noun) a game in which numbered balls are drawn at random and players cover the corresponding numbers on their cards | Synonyms: beano, bingo, keno |
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| lotus | (noun) white Egyptian lotus: water lily of Egypt to southeastern Africa; held sacred by the Egyptians | Synonyms: Egyptian water lily, Nymphaea lotus, white lily, white lotus |
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| (noun) native to eastern Asia; widely cultivated for its large pink or white flowers | Synonyms: Indian lotus, Nelumbo nucifera, sacred lotus |
| lotusland | (noun) an idyllic realm of contentment and self-indulgence | Synonyms: lotus land |
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| luteotropin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, prolactin |
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| macrobiotics | (noun) the theory of promoting health and longevity by means of diet (especially whole beans and grains) | - |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| maggot | (noun) the larva of the housefly and blowfly commonly found in decaying organic matter | - |
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| maillot | (noun) tights for dancers or gymnasts | - |
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| (noun) a woman's one-piece bathing suit | Synonyms: tank suit |
| mammoth | (noun) any of numerous extinct elephants widely distributed in the Pleistocene; extremely large with hairy coats and long upcurved tusks | - |
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| mammothermography | (noun) the use of thermography to detect breast tumors (which appear as hot spots) | - |
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| manicotti | (noun) large pasta tubes stuffed with chopped meat or mild cheese and baked in tomato sauce | - |
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| manroot | (noun) tropical American prostrate or climbing herbaceous perennial having an enormous starchy root; sometimes held to be source of the sweet potato | Synonyms: Ipomoea fastigiata, Ipomoea panurata, man-of-the-earth, scammonyroot, wild potato vine, wild sweet potato vine |
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| marmot | (noun) stocky coarse-furred burrowing rodent with a short bushy tail found throughout the Northern Hemisphere; hibernates in winter | - |
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| mascot | (noun) a character, animal or object that is adopted by a team or group as a symbolic figure | - |
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| massicot | (noun) the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment | Synonyms: massicotite |
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| massicotite | (noun) the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment | Synonyms: massicot |
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| matelote | (noun) highly seasoned soup or stew made of freshwater fishes (eel, carp, perch) with wine and stock | - |
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| melilot | (noun) erect annual or biennial plant grown extensively especially for hay and soil improvement | Synonyms: melilotus, sweet clover |
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| melilotus | (noun) erect annual or biennial plant grown extensively especially for hay and soil improvement | Synonyms: melilot, sweet clover |
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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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| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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| metaproterenol | (noun) a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness | Synonyms: Alupent |
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| methotrexate | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: amethopterin, methotrexate sodium |
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| mezzotint | (noun) print produced by an engraving that has been scraped to represent light or shade | - |
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| microdot | (noun) photograph reduced to the size of a dot (usually for purposes of security) | - |
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| microphotometer | (noun) special kind of densitometer that measures density variations over a very small area | - |
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| microtome | (noun) scientific instrument that cuts thin slices of something for microscopic examination | - |
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| microtoponym | (noun) a name of a "minor" or small natural feature (e.g., a field, path, bridge, ditch, etc.). | - |
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| microtubule | (noun) a microscopically small tubule | - |
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| miotic | (noun) a drug that causes miosis (constriction of the pupil of the eye) | Synonyms: miotic drug, myotic, myotic drug |
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| misquotation | (noun) an incorrect quotation | Synonyms: misquote |
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| misquote | (noun) an incorrect quotation | Synonyms: misquotation |
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| momot | (noun) tropical American bird resembling a blue jay and having greenish and bluish plumage | Synonyms: motmot |
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| monocot | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, liliopsid, monocotyledon |
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| monocotyledon | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, liliopsid, monocot |
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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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| monotone | (noun) an unchanging intonation | Synonyms: drone, droning |
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| (noun) a single tone repeated with different words or different rhythms (especially in rendering liturgical texts) | - |
| monotony | (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: humdrum, sameness |
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| (noun) constancy of tone or pitch or inflection | - |
| monotopism | (noun) origin of a systematic group only once (as by mutation) or at a single location. | - |
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| monotreme | (noun) the most primitive mammals comprising the only extant members of the subclass Prototheria | Synonyms: egg-laying mammal |
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| monotype | (noun) a typesetting machine operated from a keyboard that sets separate characters | - |
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| (noun) the sole print made by pressing paper against a painted or inked glass or metal plate | - |
| (noun) (biology) a taxonomic group with a single member (a single species or genus) | - |
| moonshot | (noun) an ambitious project with a high chance of failure | - |
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| moot | (noun) a hypothetical case that law students argue as an exercise | - |
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| mot | (noun) a clever remark | Synonyms: bon mot |
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| mote | (noun) (nontechnical usage) a tiny piece of anything | Synonyms: atom, corpuscle, molecule, particle, speck |
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| motel | (noun) a motor hotel | - |
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| motet | (noun) an unaccompanied choral composition with sacred lyrics; intended to be sung as part of a church service; originated in the 13th century | - |
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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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| 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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| motif | (noun) a design or figure that consists of recurring shapes or colors, as in architecture or decoration | Synonyms: motive |
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| (noun) a unifying idea that is a recurrent element in literary or artistic work | Synonyms: theme |
| (noun) a theme that is repeated or elaborated in a piece of music | Synonyms: motive |
| motile | (noun) one whose prevailing mental imagery takes the form of inner feelings of action | - |
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| motilin | (noun) a gastrointestinal hormone that apparently participates in controlling smooth muscle contractions in the stomach and small intestine | - |
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| motility | (noun) a change of position that does not entail a change of location | Synonyms: motion, move, movement |
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| (noun) ability to move spontaneously and independently | - |
| motion | (noun) a change of position that does not entail a change of location | Synonyms: motility, move, movement |
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| (noun) the act of changing location from one place to another | Synonyms: move, movement |
| (noun) the use of movements (especially of the hands) to communicate familiar or prearranged signals | Synonyms: gesture |
| (noun) a formal proposal for action made to a deliberative assembly for discussion and vote | Synonyms: question |
| (noun) a natural event that involves a change in the position or location of something | Synonyms: movement |
| (noun) an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object | Synonyms: apparent motion, apparent movement, movement |
| (noun) a state of change | - |
| motionlessness | (noun) a state of no motion or movement | Synonyms: lifelessness, stillness |
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| motivating | (noun) the act of motivating; providing incentive | Synonyms: motivation |
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| motivation | (noun) the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior | Synonyms: motive, need |
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| (noun) the act of motivating; providing incentive | Synonyms: motivating |
| (noun) the condition of being motivated | - |