COMA Meaning of COMA in English n. (pl. comae) 1 Astron. a cloud of gas and dust surrounding the nucleus of a comet. 2 Bot. a tuft of silky hairs at the end of some seeds. [ L f. Gk kome hair of head ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012