rhizoverbBeta
DictionarymiasmaFoul air
noun

miasma

mee-AZ-muh/miˈæzmə/

A spreading atmosphere of foul unhealthy vapor.

A miasma rises from the stagnant pool and its rotting leaves.

A shallow stagnant pool with rotting leaves releases a low, unpleasant-looking haze, making an unhealthy vapor the unmistakable focus.
Etymology
miasmaGreekstain, pollution, defilement

Greek miasma meant a stain or pollution. That idea became airborne contamination: vapors rising from the ground and believed to cause disease, giving the word its association with unhealthy or unpleasant air.

In context

Oculus Imperia202:03
a choking toxic miasma of masonry dust and human ash through all this the procus battle group argentum
The Betrayal at Calth: The Complete History (Warhammer 40,000 & Horus Heresy Lore)

More examples

  • Opening the cellar door releases a damp, foul-smelling miasma.
  • Workers cover their noses against the miasma rising from the drains.
  • A miasma of suspicion hangs over the negotiations.

Forms

miasma · miasmas · miasmata

miasmatic adjective — Relating to foul or unhealthy air.

Similar words

fumes
Usually gases from a specific source, often irritating or toxic.
stench
Emphasizes a strong offensive smell rather than unhealthy vapor.