| mac | (noun) a waterproof raincoat made of rubberized fabric | Synonyms: macintosh, mack, mackintosh |
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| macadam | (noun) a paved surface having compressed layers of broken rocks held together with tar | Synonyms: tarmac, tarmacadam |
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| (noun) broken stone used in macadamized roadways | - |
| macadamia | (noun) any tree of the genus Macadamia | Synonyms: macadamia tree |
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| macamba | (noun) tropical American feather palm having a swollen spiny trunk and edible nuts | Synonyms: Acrocomia aculeata, gri-gri, grugru, grugru palm |
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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) pasta in the form of slender tubes | - |
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| (noun) a British dandy in the 18th century who affected Continental mannerisms | - |
| 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) a ceremonial staff carried as a symbol of office or authority | - |
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| (noun) spice made from the dried fleshy covering of the nutmeg seed | - |
| (noun) an official who carries a mace of office | Synonyms: macebearer, macer |
| 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 | (noun) a macerated substance, sometimes used to infuse vodka with flavor. | - |
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| maceration | (noun) extreme leanness (usually caused by starvation or disease) | Synonyms: boniness, bonyness, emaciation, gauntness |
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| (noun) softening due to soaking or steeping | - |
| machete | (noun) a large heavy knife used as a weapon or for cutting vegetation | Synonyms: matchet, panga |
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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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| 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: coconspirator, conspirator, plotter |
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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) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, automobile, car, motorcar |
| (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) an intricate organization that accomplishes its goals efficiently | - |
| (noun) an efficient person | - |
| 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 | (noun) a male exhibiting or characterized by machismo | - |
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| macintosh | (noun) a waterproof raincoat made of rubberized fabric | Synonyms: mac, mack, mackintosh |
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| (noun) a lightweight waterproof (usually rubberized) fabric | Synonyms: mackintosh |
| mack | (noun) a waterproof raincoat made of rubberized fabric | Synonyms: mac, macintosh, mackintosh |
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| mackerel | (noun) any of various fishes of the family Scombridae | - |
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| (noun) flesh of very important usually small (to 18 in) fatty Atlantic fish | - |
| mackinaw | (noun) a heavy woolen cloth heavily napped and felted, often with a plaid design | - |
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| (noun) a flat-bottomed boat used on upper Great Lakes | Synonyms: Mackinaw boat |
| (noun) a thick plaid blanket formerly used in the northwestern United States | Synonyms: Mackinaw blanket |
| (noun) a short plaid coat made of made of thick woolen material | Synonyms: Mackinaw coat |
| 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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| macrencephaly | (noun) an abnormally large braincase | - |
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| macro | (noun) a single computer instruction that results in a series of instructions in machine language | Synonyms: macro instruction |
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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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| 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: cosmos, creation, existence, universe, world |
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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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| 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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| 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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| 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 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 |
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| (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macule |
| (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: sunspot |
| maculation | (noun) the act of spotting or staining something | Synonyms: spotting, staining |
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| (noun) a small contrasting part of something | Synonyms: dapple, fleck, patch, speckle, spot |
| 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) a Brazilian religious cult of African origin; combines voodoo elements with singing and chanting and dancing | - |
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| (noun) popular dance music of Brazil; derived from the practices of the macumba religious cult | - |
| (noun) (Brazil) followers of a religious cult of African origin | - |
| macushla | (noun) (an Irish term of address expressing affection) darling | - |
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