Ef‐flu″vi‐um (?), n.; pl.Effluvia (#). [L., a flowing out, fr. effluere to flow out. See Effluent, a.] 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.