WordWeb Online

1. An unwholesome atmosphere
   "the novel spun a miasma of death and decay";
   - miasm
    
2. Unhealthy vapours rising from the ground or other sources
   "a miasma of cigar smoke"; "the miasma of the marshes";
   - miasm

Derived forms: miasmata, miasmas

Type of: air pollution, ambiance, ambience, atmosphere

Encyclopedia: Miasma