Subtile or invisible emanation; exhalation perceived by the sense of smell; especially, noisome or noxious exhalation; as, the effluvium from diseased or putrefying bodies, or from ill drainage.
- A usually invisible emanation or exhalation, as of vapor or gas.
- A byproduct or residue; waste.
- The odorous fumes given off by waste or decaying matter.
- An impalpable emanation; an aura.