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WordNet (r) 3.0 (2006) (WordNet)

miasm
n 1: an unwholesome atmosphere; "the novel spun a miasma of
death and decay" [synonym: {miasma}, {miasm}]
2: unhealthy vapors rising from the ground or other sources;
"the miasma of the marshes"; "a miasma of cigar smoke" [synonym:
{miasma}, {miasm}]