Definition 1: Potentially noxious, usually nauseating vapor or gas.
Usage 1: The plural is "effluvia" though "effluviums" is now acceptable in the U.S.
Definition 2: A by-product or waste.
Suggested usage: Here is the word you need to speak about embarrassing odors in polite company: "I offered him a breath mint in hopes of dissipating the effluvium." Another way of using this word: "The effluvium emanating from the kitchen dissuaded Hilda from accepting the invitation to dinner." You also circumvent the agonizing decision whether to use "stench" or "stink."
Etymology: From Latin effluere "to flow out" from ex "from, out of" and flu-ere "flow", also borrowed in English words like influence, confluence, mellifluous, reflux, and fluid. The Proto-Indo-European root, *bhleu-, from which flu- came, turns up in English "bloat."
—Dr. Language, yourDictionary.com
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