Effluvium
Pronunciation : Ef*flu"vi*um
Part of Speech : n.;
Etymology : [L., a flowing out, fr. effluere to flow out. See Effluent, a.]
Definition : Defn: 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.
pl. Effluvia.
Source : Webster's Unabridged Dictionary, 1913