| 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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| mei | (noun) Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits | Synonyms: Japanese apricot, Prunus mume |
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| meiosis | (noun) understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary) | Synonyms: litotes |
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| (noun) (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants) | Synonyms: miosis, reduction division |
| meitnerium | (noun) a radioactive transuranic element, with atomic number 109 | Synonyms: atomic number 109, element 109, Mt |
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| melaena | (noun) abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding) | Synonyms: melena |
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| melagra | (noun) rheumatic or myalgic pains in the arms or legs | - |
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| melamine | (noun) a white crystalline organic base; used mainly in making melamine resins | Synonyms: cyanuramide |
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| melancholia | (noun) extreme depression characterized by tearful sadness and irrational fears | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| melancholic | (noun) someone subject to melancholia | Synonyms: melancholiac |
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| melancholy | (noun) a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy | Synonyms: black bile |
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| (noun) a feeling of thoughtful sadness | - |
| (noun) a constitutional tendency to be gloomy and depressed | - |
| melange | (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
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| melanin | (noun) insoluble pigments that account for the color of e.g. skin and scales and feathers | - |
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| melanism | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanosis |
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| melanoblast | (noun) an epidermal cell that is a precursor of a melanocyte | - |
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| melanocyte | (noun) a cell in the basal layer of the epidermis that produces melanin under the control of the melanocyte-stimulating hormone | - |
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| melanoderma | (noun) abnormally dark skin caused by increased deposits of melatonin | - |
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| melanoma | (noun) any of several malignant neoplasms (usually of the skin) consisting of melanocytes | Synonyms: malignant melanoma |
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| melanosis | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanism |
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| melasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: chloasma, mask of pregnancy |
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| melatonin | (noun) hormone secreted by the pineal gland | - |
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| meld | (noun) a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank | Synonyms: basket rummy, canasta |
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| melee | (noun) a noisy riotous fight | Synonyms: battle royal, scrimmage |
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| melena | (noun) abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding) | Synonyms: melaena |
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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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| melioration | (noun) the act of relieving ills and changing for the better | Synonyms: amelioration, betterment |
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| (noun) the linguistic process in which over a period of time a word grows more positive in connotation or more elevated in meaning | - |
| (noun) a condition superior to an earlier condition | Synonyms: improvement |
| meliorism | (noun) the belief that the world can be made better by human effort | - |
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| meliorist | (noun) a disputant who advocates reform | Synonyms: crusader, reformer, reformist, social reformer |
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| mellitate | (noun) a salt of mellitic acid. | - |
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| mellowing | (noun) the process of becoming mellow | - |
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| mellowness | (noun) the property of a sensation that is rich and pleasing | Synonyms: fullness, richness |
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| (noun) a soft shade of a color | - |
| (noun) geniality, as through the effects of alcohol or marijuana | - |
| (noun) a taste (especially of fruit) that is ripe and of full flavor | - |
| (noun) a feeling of good humor and sympathy through maturity or intoxication or a relaxed state | - |
| melodiousness | (noun) the property of having a melody | Synonyms: tunefulness |
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| melodrama | (noun) an extravagant comedy in which action is more salient than characterization | - |
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| melody | (noun) the perception of pleasant arrangements of musical notes | Synonyms: tonal pattern |
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| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, line, melodic line, melodic phrase, strain, tune |
| meloid | (noun) beetle that produces a secretion that blisters the skin | Synonyms: blister beetle |
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| melon | (noun) any of numerous fruits of the gourd family having a hard rind and sweet juicy flesh | - |
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| (noun) any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers | Synonyms: melon vine |
| melosa | (noun) South American herb with sticky glandular foliage; source of madia oil | Synonyms: Chile tarweed, madia oil plant, Madia sativa |
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| melphalan | (noun) antineoplastic drug (trade name Alkeran) used to treat multiple myeloma and some other malignancies | Synonyms: Alkeran |
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| melt | (noun) the process whereby heat changes something from a solid to a liquid | Synonyms: melting, thaw, thawing |
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| meltability | (noun) Capability of being reduced from a solid to a liquid state usually by heat. | - |
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| meltdown | (noun) a disaster comparable to a nuclear meltdown | - |
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| (noun) severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping | Synonyms: nuclear meltdown |
| melter | (noun) a worker who melts substances (metal or wax etc.) | - |
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| melting | (noun) the process whereby heat changes something from a solid to a liquid | Synonyms: melt, thaw, thawing |
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| meltwater | (noun) melted snow or ice | - |
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| mem | (noun) the 13th letter of the Hebrew alphabet | - |
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| member | (noun) an external body part that projects from the body | Synonyms: appendage, extremity |
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| (noun) the male sex organ | Synonyms: penis, phallus |
| (noun) an organization that is a member of another organization (especially a state that belongs to a group of nations) | - |
| (noun) one of the persons who compose a social group (especially individuals who have joined and participate in a group organization) | Synonyms: fellow member |
| (noun) anything that belongs to a set or class | - |
| membership | (noun) the body of members of an organization or group | Synonyms: rank |
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| (noun) the state of being a member | - |
| membrane | (noun) a thin pliable sheet of material | - |
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| (noun) a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants | Synonyms: tissue layer |
| membranophone | (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: drum, tympan |
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| meme | (noun) a cultural unit (an idea or value or pattern of behavior) that is passed from one person to another by non-genetic means (as by imitation) | - |
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| memento | (noun) a reminder of past events | Synonyms: souvenir |
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| memetics | (noun) a theory of mental content based on an analogy with Darwinian evolution. | - |
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| memo | (noun) a written proposal or reminder | Synonyms: memoranda, memorandum |
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| memoir | (noun) an account of the author's personal experiences | - |
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| (noun) an essay on a scientific or scholarly topic | - |
| memorabilia | (noun) a record of things worth remembering | - |
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| memorability | (noun) the quality of being worth remembering | - |
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| memoranda | (noun) a written proposal or reminder | Synonyms: memo, memorandum |
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| memorandum | (noun) a written proposal or reminder | Synonyms: memo, memoranda |
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