MIASMA Meaning of MIASMA in English n. (pl. miasmata or miasmas) archaic an infectious or noxious vapour. Derivatives: miasmal adj. miasmatic adj. miasmic adj. miasmically adv. Etymology: Gk, defilement, f. miaino pollute Oxford English vocab. Оксфордский английский словарь. 2012