| meller | n. | melodrama | informal | |
| melodeon | n. | small wind organ; small accordion | ||
| menarche | n. | first onset of menstruation | ||
| mendicant | n. | beggar; member of religious order depending entirely upon alms | ||
| menology | n. | written calendar of saints’ biographies, arranged by each saint’s feast day | ||
| mens rea | n. | criminal intent, mental knowledge of wrongdoing which forms part of some crimes | Latin | |
| menstruum | n. | menstrual discharge; solvent | obsolete | |
| mensural | adj. | pertaining to measure | ||
| mephitic | adj. | foul-smelling; noxious | ||
| mercer | n. | textiles dealer | ||
| merchet | n. | feudal fine paid to lord upon a daughter’s marriage | ||
| mereological | adj. | of or related to the study of relations between the whole and its component parts | ||
| mereology | n. | study or philosophy of relationships between parts and wholes | ||
| meretricious | adj. | of or pertaining to or characteristic of a harlot; tawdry, alluring by false or vulgar show; deceptive | ||
| merle | n. | blackbird | ||
| merlon | n. | upright section of battlement between crenels | ||
| Merry Widow | n. | condom | slang | |
| merryandrew | n. | buffoon, clown; assistant to a mountebank | ||
| mesclun | n. | salad of mixed young greens | ||
| mesentery | n. | membraneous organ attaching intestines to the rear abdominal wall | ||
| messuage | n. | dwelling house along with its outbuildings and attached lands dedicated to household use | ||
| mestizo | n. | mixed race person, esp. a Latin American or Filipino with both native and European ancestry | ||
| metal | v. | to surface a road with broken stone | British | |
| mete | v. | to apportion, to allot | ||
| metempsychosis | n. | transmigration of the soul | ||
| meteoroid | n. | small body moving through space | ||
| methyphobia | n. | fear of alcohol or of drinking or drinkers of alcohol | ||
| metic | n. | foreign resident required to pay tax to live in Ancient Greek city states | ||
| metonymy | n. | rhetorical figure in which a thing or concept is used to refer to a thing with which it is associated or related | ||
| metope | n. | panel between triglyphs in a Doric frieze | architecture | |
| metoposcopy | n. | telling fortunes or reading character from studying lines on the forehead | ||
| mettlesome | adj. | possessing marked vigor and courage | ||
| mews | n. | alley where stables are found; street with houses built from former stables or built to look like stables | ||
| mickle | adj. | much, a large amount | archaic | |
| micturate | v. | to urinate | ||
| micturition | n. | the act of urinating | ||
| midden | n. | dunghill | ||
| midinette | n. | Parisian salesgirl or milliner’s assistant | ||
| militate | v. | to substantially weigh (usu. against) | ||
| milk-toast | n. | breakfast dish made of toasted bread in milk, often served with either salt or sugar | ||
| mill lade | n. | mill race, mill leat | Scots | |
| milt | n. | fish semen; spleen of a breeding animal | ||
| milter | n. | male fish during spawning time | ||
| mim | adj. | demure, primly reticent, pretentiously shy | Scots | |
| minatory | adj. | threatening, menacing | ||
| minced oath | n. | euphemism for objectionable term or phrase formed by replacing taboo element with another word or expression | ||
| mine-run | adj. | average, not special or distinguished in any way, run of the mill | ||
| mingy | adj. | miserly, stingy | ||
| minimus | n. | creature of the smallest size; fifth digit, little finger or toe | ||
| miniver | n. | white fur lining or trim |
