Ef·flu·vi·um n.; pl. Effluvia 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.
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effluvium
n : a foul-smelling outflow or vapor (especially a gaseous
waste)
[also: effluvia (pl)]