| | metallurgical | a. pertaining to art or skill of removing metals from ores | 
| meteorite | n. stony or metallic mass of matter that has fallen to the earth's surface from outer space | 
| miasma | n. swamp gas; heavy, vaporous atmosphere, often emanating from decaying matter; pervasive corrupting influence | 
| microcosm | n. small, representative system having analogies to larger system; miniature model of something | 
| migrant | a. habitually moving from place to place especially in search of seasonal work; wandering | 
| migratory | a. wandering; moving from place to place; unsettled | 
| milieu | n. environment; person’s social setting or environment | 
| militant | n. a fighting or aggressive person or party | 
| mimicry | n. imitation; act, practice, or art of mimicking | 
| mincing | a. speaking or walking affectedly or with caution; affectedly elegant and nice | 
| mind-blower | n. one that intensely affects the mind or emotions | 
| minutia | n. petty details; small particular or detail; a minute or trivial matter of fact | 
| misanthrope | n. one who hates or mistrusts mankind | 
| misapprehension | n. wrong apprehension of one's meaning or of a fact; misunderstanding | 
| miscellany | n. collection of various items, parts, or ingredients, especially one composed of diverse literary works | 
| misconstrue | v. interpret incorrectly; misjudge; mistake the meaning of | 
| miserly | a. indicative of lack of generosity; cautious with money | 
| misnomer | n. error in naming a person or place; name wrongly or unsuitably applied to a person or an object | 
| misrepresent | v. give false or incorrect impression, often deliberately; serve unsatisfactorily as representative | 
| missive | n. letter; written message; messenger | 
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