"tumor composed of bone-marrow cells," 1848, from Greek myelos "marrow" (a word of unknown origin) + -oma.

also mina, name given to various passerine birds of India and the East, 1769, from Hindi maina "a starling," from Sanskrit madana- "delightful, joyful," related to madati "it gladdens," literally "it bubbles," perhaps from PIE root *mad- "moist, wet" (see mast (n.2)). The "talking starling" of India is Eulabes religiosa.

also m.y.o.b., by 1846, American English slang, an abbreviation of mind your own business. Often in M.Y.O.B. Society, an imaginary organization which a too-inquisitive person would be invited to join.

"muscular substance of the heart," 1866, from myo- "muscle" + Latinized form of Greek kardia "heart" (from PIE root *kerd- "heart"). Related: Myocardial; myocardiac; myocarditis.

"the science of muscles," 1640s; see myo- + -logy. Related: Myologist; myological.

1725, divination by the movements of mice, from Greek myo-, combining form of mys (see mouse (n.)) + -mancy "divination by means of." Related: Myomantic.

"short-sighted person," 1728, from French myope "short-sighted" (16c.), from Late Latin myop-, from Greek myōps "short-sighted" (see myopia).

"short-sightedness," 1727, medical Latin, from Late Greek myōpia "near-sightedness," from myōps "near-sighted," literally "closing the eyes, blinking," on the notion of "squinting, contracting the eyes" (as near-sighted people do), from myein "to shut" (see mute (adj.)) + ōps (genitive ōpos) "eye" (from PIE root *okw- "to see"). By coincidence the name describes the problem: the parallel rays of light are brought to a focus before they reach the retina.