| m | (adjective) denoting a quantity consisting of 1,000 items or units | Synonyms: 1000, k, one thousand, thousand |
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| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: meter, metre |
| (noun) the 13th letter of the Roman alphabet | Synonyms: M |
| ma | (noun) informal terms for a mother | Synonyms: mamma, mummy, mum, mama, mammy, mom, momma, mommy |
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| maar | (noun) a flat-bottomed volcanic crater that was formed by an explosion; often filled with water | - |
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| mac | (noun) a waterproof raincoat made of rubberized fabric | Synonyms: macintosh, mack, mackintosh |
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| macabre | (adjective) shockingly repellent; inspiring horror | Synonyms: ghastly, grim, grisly, gruesome, sick |
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| macadam | (noun) broken stone used in macadamized roadways | - |
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| (noun) a paved surface having compressed layers of broken rocks held together with tar | Synonyms: tarmac, tarmacadam |
| (verb) surface with macadam | Synonyms: macadamise, macadamize, tarmac |
| macadamia | (noun) any tree of the genus Macadamia | Synonyms: macadamia tree |
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| macadamise | (verb) surface with macadam | Synonyms: macadam, macadamize, tarmac |
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| macadamize | (verb) surface with macadam | Synonyms: macadam, macadamise, tarmac |
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| macamba | (noun) tropical American feather palm having a swollen spiny trunk and edible nuts | Synonyms: gri-gri, grugru, grugru palm, Acrocomia aculeata |
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| macaque | (noun) short-tailed monkey of rocky regions of Asia and Africa | - |
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| macaron | (noun) a sweet meringue-based confection made with egg white, icing sugar, granulated sugar, almond powder or ground almond, and food colouring. | - |
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| macaroni | (noun) a British dandy in the 18th century who affected Continental mannerisms | - |
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| (noun) pasta in the form of slender tubes | - |
| macaronic | (adjective) of or containing a mixture of Latin words and vernacular words jumbled together | - |
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| macaroon | (noun) chewy cookie usually containing almond paste | - |
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| macaw | (noun) long-tailed brilliantly colored parrot of Central America and South America; among the largest and showiest of parrots | - |
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| mace | (noun) an official who carries a mace of office | Synonyms: macebearer, macer |
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| (noun) spice made from the dried fleshy covering of the nutmeg seed | - |
| (noun) a ceremonial staff carried as a symbol of office or authority | - |
| macebearer | (noun) an official who carries a mace of office | Synonyms: mace, macer |
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| macedoine | (noun) mixed diced fruits or vegetables; hot or cold | - |
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| macer | (noun) an official who carries a mace of office | Synonyms: mace, macebearer |
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| macerate | (verb) separate into constituents by soaking | - |
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| (verb) become soft or separate and disintegrate as a result of excessive soaking | - |
| (verb) soften, usually by steeping in liquid, and cause to disintegrate as a result | - |
| (verb) cause to grow thin or weak | Synonyms: waste, emaciate |
| (noun) a macerated substance, sometimes used to infuse vodka with flavor. | - |
| maceration | (noun) softening due to soaking or steeping | - |
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| (noun) extreme leanness (usually caused by starvation or disease) | Synonyms: gauntness, emaciation, boniness, bonyness |
| macerative | (adjective) accompanied by or characterized by maceration | - |
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| machete | (noun) a large heavy knife used as a weapon or for cutting vegetation | Synonyms: matchet, panga |
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| machicolate | (verb) supply with projecting galleries | - |
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| machicolation | (noun) a projecting parapet supported by corbels on a medieval castle; has openings through which stones or boiling water could be dropped on an enemy | - |
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| machilid | (noun) wingless insect living in dark moist places as under dead tree trunks; they make erratic leaps when disturbed | Synonyms: jumping bristletail |
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| machinate | (verb) arrange by systematic planning and united effort | Synonyms: prepare, organise, organize, get up, devise |
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| (verb) engage in plotting or enter into a conspiracy, swear together | Synonyms: cabal, complot, conjure, conspire |
| machination | (noun) a crafty and involved plot to achieve your (usually sinister) ends | Synonyms: intrigue |
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| machinator | (noun) a member of a conspiracy | Synonyms: plotter, coconspirator, conspirator |
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| machine | (noun) any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks | - |
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| (noun) an efficient person | - |
| (noun) an intricate organization that accomplishes its goals efficiently | - |
| (noun) a device for overcoming resistance at one point by applying force at some other point | Synonyms: simple machine |
| (noun) a group that controls the activities of a political party | Synonyms: political machine |
| (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: motorcar, car, auto, automobile |
| (verb) turn, shape, mold, or otherwise finish by machinery | - |
| (verb) make by machinery | - |
| machinelike | (adjective) resembling the unthinking functioning of a machine | Synonyms: robotic, robotlike, automatic, automatonlike |
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| machinery | (noun) machines or machine systems collectively | - |
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| (noun) a system of means and activities whereby a social institution functions | - |
| machinist | (noun) a craftsman skilled in operating machine tools | Synonyms: mechanic, shop mechanic |
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| machismo | (noun) exaggerated masculinity | - |
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| machmeter | (noun) speedometer for measuring the speed of an aircraft relative to the speed of sound | - |
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| macho | (adjective) used of men; markedly masculine in appearance or manner | Synonyms: butch |
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| (noun) a male exhibiting or characterized by machismo | - |
| macintosh | (noun) a lightweight waterproof (usually rubberized) fabric | Synonyms: mackintosh |
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| (noun) a waterproof raincoat made of rubberized fabric | Synonyms: mac, mack, mackintosh |
| mack | (noun) a waterproof raincoat made of rubberized fabric | Synonyms: mac, macintosh, mackintosh |
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| mackerel | (noun) flesh of very important usually small (to 18 in) fatty Atlantic fish | - |
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| (noun) any of various fishes of the family Scombridae | - |
| mackinaw | (noun) a short plaid coat made of made of thick woolen material | Synonyms: Mackinaw coat |
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| (noun) a thick plaid blanket formerly used in the northwestern United States | Synonyms: Mackinaw blanket |
| (noun) a flat-bottomed boat used on upper Great Lakes | Synonyms: Mackinaw boat |
| (noun) a heavy woolen cloth heavily napped and felted, often with a plaid design | - |
| mackintosh | (noun) a lightweight waterproof (usually rubberized) fabric | Synonyms: macintosh |
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| (noun) a waterproof raincoat made of rubberized fabric | Synonyms: mac, macintosh, mack |
| mackle | (noun) a printed impression that is blurred or doubled | - |
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| macon | (noun) fine Burgundy wine usually white and dry | Synonyms: maconnais |
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| maconnais | (noun) fine Burgundy wine usually white and dry | Synonyms: macon |
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| macrame | (noun) a relatively coarse lace; made by weaving and knotting cords | - |
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| (verb) make knotted patterns | - |
| macrencephalic | (adjective) having a large brain case | Synonyms: macrencephalous |
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| macrencephalous | (adjective) having a large brain case | Synonyms: macrencephalic |
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| macrencephaly | (noun) an abnormally large braincase | - |
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| macro | (adjective) very large in scale or scope or capability | - |
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| (noun) a single computer instruction that results in a series of instructions in machine language | Synonyms: macro instruction |
| macrobiotic | (adjective) of or relating to the theory or practice of macrobiotics | - |
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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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| macrocephalic | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalous |
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| macrocephalous | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalic |
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| macrocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: megacephaly, megalocephaly |
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| macrocosm | (noun) everything that exists anywhere | Synonyms: creation, universe, world, existence, cosmos |
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| macrocosmic | (adjective) relating to or constituting a macrocosm | - |
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| macrocyte | (noun) abnormally large red blood cell (associated with pernicious anemia) | Synonyms: megalocyte |
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| macrocytosis | (noun) the presence of macrocytes in the blood | - |
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| macroeconomic | (adjective) of or relating to macroeconomics | - |
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| macroeconomics | (noun) the branch of economics that studies the overall working of a national economy | - |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| macroelement | (noun) a chemical element required in relatively large quantities for the normal physiologic processes of the body. | Synonyms: major mineral |
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| macroevolution | (noun) evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups | - |
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| macroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: astroglia |
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| macroglossia | (noun) a congenital disorder characterized by an abnormally large tongue; often seen in cases of Down's syndrome | - |
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| macromolecular | (adjective) relating to or consisting of or characterized by macromolecules | - |
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| macromolecule | (noun) any very large complex molecule; found only in plants and animals | Synonyms: supermolecule |
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| macron | (noun) a diacritical mark (-) placed above a vowel to indicate a long sound | - |
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| macrophage | (noun) a large phagocyte; some are fixed and other circulate in the blood stream | - |
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| macroscopic | (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopical |
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| (adjective) large enough to be visible with the naked eye | Synonyms: macroscopical |
| macroscopical | (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopic |
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| (adjective) large enough to be visible with the naked eye | Synonyms: macroscopic |
| macroscopically | (adverb) without using a microscope | - |
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| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| macrospore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: megaspore |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| macrozamia | (noun) any treelike cycad of the genus Macrozamia having erect trunks and pinnate leaves and large cones with sometimes edible nuts; Australia | - |
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| macula | (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: sunspot |
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| (noun) a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision | Synonyms: macula lutea, macular area, yellow spot |
| (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macule |
| maculate | (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: defile, stain, sully, tarnish |
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| (verb) spot, stain, or pollute | Synonyms: foul, defile, befoul |
| (adjective) morally blemished; stained or impure | Synonyms: defiled |
| (adjective) spotted or blotched | - |
| maculation | (noun) a small contrasting part of something | Synonyms: patch, spot, fleck, dapple, speckle |
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| (noun) the act of spotting or staining something | Synonyms: spotting, staining |
| macule | (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macula |
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| macumba | (noun) (Brazil) followers of a religious cult of African origin | - |
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| (noun) popular dance music of Brazil; derived from the practices of the macumba religious cult | - |
| (noun) a Brazilian religious cult of African origin; combines voodoo elements with singing and chanting and dancing | - |
| macushla | (noun) (an Irish term of address expressing affection) darling | - |
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| mad | (adjective) roused to anger | Synonyms: huffy, sore |
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| (adjective) affected with madness or insanity | Synonyms: unbalanced, unhinged, demented, disturbed, sick, crazy, brainsick |
| (adjective) marked by uncontrolled excitement or emotion | Synonyms: unrestrained, delirious, excited, frantic |
| (adjective) very foolish | Synonyms: insane, harebrained |
| madake | (noun) large bamboo having thick-walled culms; native of China and perhaps Japan; widely grown elsewhere | Synonyms: Phyllostachys bambusoides, ku-chiku, giant timber bamboo |
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| madam | (noun) a woman of refinement | Synonyms: ma'am, dame, gentlewoman, lady |
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| (noun) a woman who runs a house of prostitution | Synonyms: brothel keeper |
| madame | (noun) title used for a married Frenchwoman | - |
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| madcap | (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: impetuous, impulsive, hotheaded, brainish, tearaway |
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| (noun) a reckless impetuous irresponsible person | Synonyms: harum-scarum, hothead, daredevil, swashbuckler, lunatic |
| madden | (verb) cause to go crazy; cause to lose one's mind | Synonyms: craze |
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| (verb) drive up the wall; go on someone's nerves | - |
| (verb) make mad | - |
| maddened | (adjective) marked by extreme anger | Synonyms: infuriated, enraged, angered, furious |
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| maddening | (adjective) extremely annoying or displeasing | Synonyms: infuriating, exasperating, vexing |
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| madder | (verb) color a moderate to strong red | - |
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| (noun) Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin | Synonyms: Rubia tinctorum |
| madderwort | (noun) any of numerous trees or shrubs or vines of the family Rubiaceae | Synonyms: rubiaceous plant |
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| made | (adjective) (of a bed) having the sheets and blankets set in order | - |
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| (adjective) produced by a manufacturing process | - |
| (adjective) successful or assured of success | - |
| mademoiselle | (noun) small silvery drumfish often mistaken for white perch; found along coasts of United States from New York to Mexico | Synonyms: silver perch, Bairdiella chrysoura |
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| madhouse | (noun) pejorative terms for an insane asylum | Synonyms: snake pit, nut house, nuthouse, sanatorium, crazy house, cuckoo's nest, Bedlam, booby hatch, funny farm, funny house, loony bin |
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| madly | (adverb) in an ungovernable manner | Synonyms: frantically |
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| (adverb) in an insane manner | Synonyms: insanely, dementedly, crazily |
| (adverb) (used as intensives) excessively | Synonyms: insanely, deadly, deucedly, devilishly |
| madman | (noun) an insane person | Synonyms: maniac, lunatic |
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| madnep | (noun) biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root; the ancestor of cultivated parsnip | Synonyms: wild parsnip |
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| madness | (noun) obsolete terms for legal insanity | Synonyms: lunacy, insaneness |
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| (noun) an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain | Synonyms: rabies, hydrophobia, lyssa |
| (noun) a feeling of intense anger | Synonyms: rage, fury |
| (noun) the quality of being rash and foolish | Synonyms: craziness, folly, foolishness |
| (noun) unrestrained excitement or enthusiasm | Synonyms: rabidity, rabidness |