1. A usually invisible emanation or exhalation, as of vapour or gas.
a. A by-product or residue; waste.
b. The odorous fumes given off by waste or decaying matter.
3. An impalpable emanation; an aura.
Coming into the cellar
We could easily recognize
When Serendipity had been by
She left an effluvium
About the rounds of cheese
Decay and transformation
That delighted mice and men
But puzzled tourists
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