<word meaning and root formation>

Macrologist: a person who engages in long and tiresome talk; ie, a bore [Gk. makrós, (“long”) + –logo (“word”) + -ist]

Macromastic: pertaining to large breasts; (Med.) (also called gigantomastic breasts) breasts which are usually heavy and pendulous with nipples and areolas facing down [Gk. macrós- (“long”) +‎ -mastia (“abnormality of the breast”)]

Macrophallic: having an unusually large phallus [Gk. macrós- (“long”) +‎ -phallós (“penis”)]

Marcid: exhausted; withered; wasted away; decayed [from L. marceō (“wither”) +‎ -idus]

Megapod: having large feet [from Gk. mégas (“great”) + -poús “foot”)] 👣

Menseful: considerate; neat and clean [from mensk, from MidEng. menske (“courtesy”; “honour”)]

Mentulate: Referring to or characterised by a large penis; well-hung [from mentula (“cock”; “dick”; “penis”) +‎ -ātus (“-ed”)]

Merkin: a pubic wig for women (Grose’s Dictionary of the Vulgar Tongue: “counterfeit hair for women’s privy parts”) [Origin uncertain but prob. from malkin, a derogatory term for a lower-class young woman]

Metoposcopy: using the physical appearance of the face (esp the pattern-lines on the forehead) to judge someone’s character [from Gk. métōpon, “forehead”) +‎ -scopy]

Minimifidianism: having virtually no or almost no faith or belief [from L. minimus (“small”; “little”) + –fidian (?) + -ism]

Monandrous: having only one male sexual partner over a period of time [monós (“one”; “single”; “only”) + –androus (“man”; “husband”)]

Mummer: an actor in a traditional masked mime (a mummer’s play) [OldFr. momeur from mommer (“act in a mime”)]

Murcid: slothful; shirking work or duty (OU)

Mystagogue: one who instructs in mystical or arcane lore or doctrines [Gk. mystagōgos, from mystēs (“initiate”) + –agein (“to lead”)]

Key: OU = origin unknown