| meg | (noun) the number that is represented as a one followed by 6 zeros | Synonyms: 1000000, million, one thousand thousand |
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| megabat | (noun) large Old World bat of warm and tropical regions that feeds on fruit | Synonyms: fruit bat |
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| megabit | (noun) a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits | Synonyms: Mb, Mbit |
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| megabucks | (noun) a large sum of money (especially as pay or profit) | Synonyms: big bucks, big money, bundle, pile |
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| megabyte | (noun) a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes | Synonyms: M, MB, mebibyte, MiB |
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| (noun) a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes | Synonyms: M, MB |
| megacardia | (noun) an abnormal enlargement of the heart | Synonyms: cardiomegaly, enlarged heart, megalocardia |
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| megacephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megalocephaly |
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| megacolon | (noun) an abnormal enlargement of the colon; can be congenital (as in Hirschsprung's disease) or acquired (as when children refuse to defecate) | - |
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| megacycle | (noun) one million periods per second | Synonyms: Mc, megacycle per second, megahertz, MHz |
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| megadeath | (noun) the death of a million people | - |
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| megadose | (noun) an exceptionally large dose, as of a drug or vitamin. | - |
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| megaflop | (noun) (computer science) a unit for measuring the speed of a computer system, one megaflops is a million floating point operations per second | Synonyms: MFLOP, million floating point operations per second |
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| megagametophyte | (noun) the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores | - |
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| megahertz | (noun) one million periods per second | Synonyms: Mc, megacycle, megacycle per second, MHz |
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| megahit | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: blockbuster, smash hit |
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| megakaryocyte | (noun) a large bone marrow cell; regarded as the source of blood platelets | - |
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| megalith | (noun) memorial consisting of a very large stone forming part of a prehistoric structure (especially in western Europe) | Synonyms: megalithic structure |
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| megaloblast | (noun) abnormally large red blood cell present in pernicious anemia and folic acid deficiency | - |
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| megalocardia | (noun) an abnormal enlargement of the heart | Synonyms: cardiomegaly, enlarged heart, megacardia |
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| megalocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megacephaly |
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| megalocyte | (noun) abnormally large red blood cell (associated with pernicious anemia) | Synonyms: macrocyte |
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| megalohepatia | (noun) abnormal enlargement of the liver | Synonyms: hepatomegaly |
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| megalomania | (noun) a psychological state characterized by delusions of grandeur | - |
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| megalomaniac | (noun) a pathological egotist | - |
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| megalopolis | (noun) a very large urban complex (usually involving several cities and towns) | - |
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| megalosaur | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaurus |
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| megalosaurus | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaur |
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| megaphone | (noun) a cone-shaped acoustic device held to the mouth to intensify and direct the human voice | - |
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| megapode | (noun) large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs | Synonyms: mound-bird, mound bird, mound builder, scrub fowl |
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| megasporangium | (noun) a plant structure that produces megaspores | Synonyms: macrosporangium |
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| megaspore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: macrospore |
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| megasporophyll | (noun) in non-flowering plants, a sporophyll that bears only megasporangia | - |
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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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| megaton | (noun) one million tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT | - |
| megawatt | (noun) a unit of power equal to one million watts | - |
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| megestrol | (noun) a synthetic progestational compound used to treat endometrial carcinoma | Synonyms: megestrol acetate |
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| megillah | (noun) (Yiddish) a long boring tediously detailed account | - |
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| megilp | (noun) a medium for oil-paints; linseed oil mixed with mastic varnish or turpentine | Synonyms: magilp |
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| megohm | (noun) a unit of resistance equal to one million ohms | - |
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| megrim | (noun) a severe recurring vascular headache; occurs more frequently in women than men | Synonyms: hemicrania, migraine, sick headache |
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| megrims | (noun) a state of depression | Synonyms: blue devils, blues, vapors, vapours |
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