| 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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| meitnerium | (noun) a radioactive transuranic element, with atomic number 109 | Synonyms: atomic number 109, element 109, Mt |
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| melanism | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanosis |
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| meliorism | (noun) the belief that the world can be made better by human effort | - |
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| mem | (noun) the 13th letter of the Hebrew alphabet | - |
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| memorandum | (noun) a written proposal or reminder | Synonyms: memo, memoranda |
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| mendelevium | (noun) a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol) | Synonyms: atomic number 101, Md, Mv |
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| meningism | (noun) symptoms that mimic those of meningitis but without inflammation of the meninges | - |
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| menstruum | (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, period |
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| (noun) (archaic) a solvent | - |
| mentalism | (noun) (philosophy) a doctrine that mind is the true reality and that objects exist only as aspects of the mind's awareness | - |
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| mentum | (noun) a projection below the mouth of certain mollusks that resembles a chin | - |
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| (noun) the protruding part of the lower jaw | Synonyms: chin |
| (noun) a projection like a chin formed by the sepals and base of the column in some orchids | - |
| mercantilism | (noun) transactions (sales and purchases) having the objective of supplying commodities (goods and services) | Synonyms: commerce, commercialism |
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| (noun) an economic system (Europe in 18th century) to increase a nation's wealth by government regulation of all of the nation's commercial interests | Synonyms: mercantile system |
| meristem | (noun) undifferentiated tissue from which new cells are formed, as at the tip of a stem or root | - |
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| meronym | (noun) a word that names a part of a larger whole | Synonyms: part name |
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| mesmerism | (noun) the act of inducing hypnosis | Synonyms: hypnotism, suggestion |
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| mesoderm | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoblast |
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| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| metabolism | (noun) the organic processes (in a cell or organism) that are necessary for life | Synonyms: metabolic process |
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| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metamorphosis |
| metamorphism | (noun) change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances | - |
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| meteortropism | (noun) an effect of climate on biological processes (as the effect on joint pains etc.) | - |
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| metonym | (noun) a word that denotes one thing but refers to a related thing | - |
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| mezereum | (noun) the dried bark of the shrub mezereon | - |
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| miasm | (noun) unhealthy vapors rising from the ground or other sources | Synonyms: miasma |
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| (noun) an unwholesome atmosphere | Synonyms: miasma |
| microcosm | (noun) a miniature model of something | - |
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| microfilm | (noun) film on which materials are photographed at greatly reduced size; useful for storage; a magnification system is used to read the material | - |
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| microgram | (noun) one millionth (1/1,000,000) gram | Synonyms: mcg |
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| microorganism | (noun) any organism of microscopic size | Synonyms: micro-organism |
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| microseism | (noun) a small earthquake | Synonyms: earth tremor, tremor |
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| microsporangium | (noun) a plant structure that produces microspores | - |
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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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| midazolam | (noun) an injectable form of benzodiazepine (trade name Versed) useful for sedation and for reducing pain during uncomfortable medical procedures | Synonyms: Versed |
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| midstream | (noun) the middle of a stream | - |
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| midterm | (noun) an examination administered in the middle of an academic term | Synonyms: midterm exam, midterm examination |
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| (noun) middle of an academic term or a political term in office | - |
| (noun) the middle of the gestation period | - |
| militarism | (noun) a political orientation of a people or a government to maintain a strong military force and to be prepared to use it aggressively to defend or promote national interests | - |
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| milium | (noun) a small whitish lump in the skin due to a clogged sebaceous gland | Synonyms: whitehead |
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| milldam | (noun) dam to make a millpond to provide power for a water mill | - |
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| millenarianism | (noun) belief in the Christian doctrine of the millennium mentioned in the Book of Revelations | Synonyms: chiliasm, millenarism, millenniumism |
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| millenarism | (noun) belief in the Christian doctrine of the millennium mentioned in the Book of Revelations | Synonyms: chiliasm, millenarianism, millenniumism |
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| millennium | (noun) a span of 1000 years | Synonyms: millenary |
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| (noun) (New Testament) in the Book of Revelation it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness | - |
| (noun) the 1000th anniversary (or the celebration of it) | Synonyms: millenary |
| millenniumism | (noun) belief in the Christian doctrine of the millennium mentioned in the Book of Revelations | Synonyms: chiliasm, millenarianism, millenarism |
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| milligram | (noun) one thousandth (1/1,000) gram | Synonyms: mg |
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| millirem | (noun) a dosage of ionizing radiation equivalent to one thousandth (1/1000) of a rem | Synonyms: mrem |
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| minim | (noun) a musical note having the time value of half a whole note | Synonyms: half note |
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| (noun) a United States liquid unit equal to 1/60 fluidram | - |
| (noun) a British imperial capacity measure (liquid or dry) equal to 1/60th fluid dram or 0.059194 cubic centimeters | - |
| minimalism | (noun) an art movement in sculpture and painting that began in the 1950s and emphasized extreme simplification of form and color | Synonyms: minimal art, reductivism |
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| minimum | (noun) the point on a curve where the tangent changes from negative on the left to positive on the right | - |
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| (noun) the smallest possible quantity | Synonyms: lower limit |
| minium | (noun) a reddish oxide of lead (Pb3O4) used as a pigment in paints and in glass and ceramics | Synonyms: red lead |
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| miserabilism | (noun) mid-20th century French art movement. | - |
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| misogynism | (noun) hatred of women | Synonyms: misogyny |
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| misoneism | (noun) hatred of change or innovation | - |
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| mm | (noun) a metric unit of length equal to one thousandth of a meter | Synonyms: millimeter, millimetre |
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| modem | (noun) (from a combination of MOdulate and DEModulate) electronic equipment consisting of a device used to connect computers by a telephone line | - |
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| moderationism | (noun) the policy of being moderate or acting with moderation | - |
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| moderatism | (noun) a political philosophy of avoiding the extremes of left and right by taking a moderate position or course of action | Synonyms: centrism |
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| modernism | (noun) practices typical of contemporary life or thought | - |
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| (noun) genre of art and literature that makes a self-conscious break with previous genres | - |
| (noun) the quality of being current or of the present | Synonyms: contemporaneity, contemporaneousness, modernity, modernness |
| modicum | (noun) a small or moderate or token amount | - |
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| molluscum | (noun) any skin disease characterized by soft pulpy nodules | - |
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| molybdenum | (noun) a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel | Synonyms: atomic number 42, Mo |
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| mom | (noun) informal terms for a mother | Synonyms: ma, mama, mamma, mammy, momma, mommy, mum, mumma, mummy |
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| momentum | (noun) an impelling force or strength | Synonyms: impulse |
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| (noun) the product of a body's mass and its velocity | - |
| momism | (noun) excessive protection | Synonyms: overprotection, overshielding |
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| monarchism | (noun) a belief in and advocacy of monarchy as a political system | - |
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| monasticism | (noun) asceticism as a form of religious life; usually conducted in a community under a common rule and characterized by celibacy and poverty and obedience | - |
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| monetarism | (noun) an economic theory holding that variations in unemployment and the rate of inflation are usually caused by changes in the supply of money | - |
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| mongolianism | (noun) a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation | Synonyms: Down's syndrome, Down syndrome, mongolism, trisomy 21 |
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| mongolism | (noun) a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation | Synonyms: Down's syndrome, Down syndrome, mongolianism, trisomy 21 |
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| monism | (noun) the doctrine that reality consists of a single basic substance or element | - |
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| monocentrism | (noun) the property of having or proceeding from a single center. | - |
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| monochromatism | (noun) complete color blindness; colors can be differentiated only on the basis of brightness | Synonyms: monochromacy, monochromasy, monochromatic vision, monochromia |
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| monogram | (noun) a graphic symbol consisting of 2 or more letters combined (usually your initials); printed on stationery or embroidered on clothing | - |
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| monoideism | (noun) a state of prolonged absorption in a single idea (as in mental depression, trance, hypnosis). | - |
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| monometallism | (noun) the use of only one metal (such as gold or silver) in the standard currency of a country, or as a standard of monetary value. | - |
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| monorchidism | (noun) failure of one testes to descend into the scrotum | Synonyms: monorchism |
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| monorchism | (noun) failure of one testes to descend into the scrotum | Synonyms: monorchidism |
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| monotheism | (noun) belief in a single God | - |
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| monotopism | (noun) origin of a systematic group only once (as by mutation) or at a single location. | - |
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| moonbeam | (noun) a ray of moonlight | Synonyms: moon-ray, moon ray |
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| moralism | (noun) judgments about another person's morality | - |
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| (noun) a moral maxim | - |
| moratorium | (noun) suspension of an ongoing activity | - |
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| (noun) a legally authorized postponement before some obligation must be discharged | - |
| mosaicism | (noun) the condition in which an organism has two or more cell populations that differ in genetic makeup | - |
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| mrem | (noun) a dosage of ionizing radiation equivalent to one thousandth (1/1000) of a rem | Synonyms: millirem |
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| multiculturalism | (noun) the doctrine that several different cultures (rather than one national culture) can coexist peacefully and equitably in a single country | - |
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| mum | (noun) secrecy | - |
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| (noun) informal terms for a mother | Synonyms: ma, mama, mamma, mammy, mom, momma, mommy, mumma, mummy |
| (noun) of China | Synonyms: Chrysanthemum morifolium, Dendranthema grandifloruom, florist's chrysanthemum, florists' chrysanthemum |
| museum | (noun) a depository for collecting and displaying objects having scientific or historical or artistic value | - |
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| mushroom | (noun) fleshy body of any of numerous edible fungi | - |
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| (noun) a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb) | Synonyms: mushroom-shaped cloud, mushroom cloud |
| (noun) common name for an edible agaric (contrasting with the inedible toadstool) | - |
| (noun) mushrooms and related fleshy fungi (including toadstools, puffballs, morels, coral fungi, etc.) | - |
| (noun) any of various fleshy fungi of the subdivision Basidiomycota consisting of a cap at the end of a stem arising from an underground mycelium | - |
| mutism | (noun) the condition of being unable or unwilling to speak | Synonyms: muteness |
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| mutualism | (noun) the relation between two different species of organisms that are interdependent; each gains benefits from the other | Synonyms: symbiosis |
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| mycelium | (noun) the vegetative part of a fungus consisting of a mass of branching threadlike hyphae | - |
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| mycobacterium | (noun) rod-shaped bacteria some saprophytic or causing diseases | Synonyms: mycobacteria |
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| myelogram | (noun) X-ray film of the spinal cord and spinal nerve roots and subarachnoid space | - |
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| mym | (noun) a metric unit of length equal to 10,000 meters | Synonyms: myriameter, myriametre |
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| myocardium | (noun) the middle muscular layer of the heart wall | - |
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| myogram | (noun) a graphical recording of muscle activity | - |
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| myometrium | (noun) the smooth muscle forming the wall of the uterus | - |
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| myriagram | (noun) one ten thousandth of a centner | Synonyms: myg |
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| mysticism | (noun) a religion based on mystical communion with an ultimate reality | Synonyms: religious mysticism |
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| (noun) obscure or irrational thought | - |
| myxobacterium | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacteria, slime bacteria |
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| naboom | (noun) small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra | Synonyms: cactus euphorbia, Euphorbia ingens |
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| nanism | (noun) a genetic abnormality resulting in short stature | Synonyms: dwarfism |
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| nanogram | (noun) one billionth (1/1,000,000,000) gram | Synonyms: ng |
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