Effluvium

n.

1.

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.

Noun

1.

effluvium - a foul-smelling outflow or vapor (especially a gaseous waste)

afterdamp, aroma, aura, blackdamp, breath, chokedamp, cloud, coal gas, damp, definite odor, detectable odor, ectoplasm, ectoplasy, emanation, essence, exhalation, exhaust, exhaust gas, exteriorized protoplasm, fetid air, firedamp, flatus, flavor, fluid, fragrance, fume, malaria, mephitis, miasma, odor, puff of smoke, redolence, reek, savor, scent, smell, smoke, smudge, spoor, steam, stench, subtle odor, trace, trail, vapor, volatile, water vapor, whiff