The Collaborative International Dictionary of English v.0.48:
Miasm \Mi"asm\, n. [Cf. F. miasme.] Miasma. [1913 Webster]WordNet (r) 3.0 (2006):
miasm n 1: an unwholesome atmosphere; "the novel spun a miasma of death and decay" [syn: miasma, miasm] 2: unhealthy vapors rising from the ground or other sources; "the miasma of the marshes"; "a miasma of cigar smoke" [syn: miasma, miasm]