Mofette Definition
mōfet
noun
A vent or fissure in an area of recent volcanic activity, emitting steam, carbon dioxide, and, sometimes, other gases.
Webster's New World
The gases escaping from such an opening.
American Heritage
Origin of Mofette
French gaseous exhalation from Italian moffetta diminutive of muffa mold, moldy smell probably of Germanic origin
From American Heritage Dictionary of the English Language, 5th Edition
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