effluvium

(ĭ-flū'vē-əm)
n., pl., -vi·a (-vē-ə), or -vi·ums.

1. A usually invisible emanation or exhalation, as of vapor or gas.
2. 1. A byproduct or residue; waste.
   2. The odorous fumes given off by waste or decaying matter.
3. An impalpable emanation; an aura.

[Latin, from effluere, to flow out. See effluent.]

effluvial ef·flu'vi·al adj.

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IN BRIEF: Something especially subtle and invisible that flows out or issues forth. (Plural).

A novel indoor air quality investigation was associated with carbon dioxide and methane accumulation, presumably from effluvia from geologic sources — www.yourdictionary.com

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Pl. effluvia [L.]
1. an outflowing or shedding, as of the hair.
2. an exhalation or emanation, especially one of noxious nature.

• anagen e. — see anagen defluxion.

For a list of words related to effluvium, see:

• Smells - effluvium: slight trace or invisible exhalation of vapor, usu. noxious or disagreeable
• Rites, Practices, Spells, and Symbols - effluvium: vapor; offensive-smelling emanation

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See words rhyming with "effluvium."