"miasma" in the noun sense

1. miasma, miasm

an unwholesome atmosphere

"the novel spun a miasma of death and decay"

2. miasma, miasm

unhealthy vapors rising from the ground or other sources

"the miasma of the marshes"

"a miasma of cigar smoke"

Source: WordNet® (An amazing lexical database of English)

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