1. an unwholesome atmosphere - the novel spun a miasma of death and decay • Syn: miasma • Derivationally related forms: miasmic (for: miasma) • Hypernyms: atmosphere, ambiance, ambience 2. unhealthy vapors rising from the ground or other sources - the miasma of the marshes - a miasma of cigar smoke • Syn: miasma • Derivationally related forms: miasmic (for: miasma), miasmal (for: miasma) • Hypernyms: air pollution