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There is also telogen effluvium which is more common than you think.— Find Free Articles - ArticlesBase
She confessed that the effluvium was altogether too powerful for her, and beat a hasty retreat to the boat, where she spent the remainder of the day in comparative comfort, only an occasional faint whiff of odour reaching her there.— Overdue The Story of a Missing Ship
I need scarcely expatiate upon the delicate and long-continuing fragrance which this luxuriant perfume imparts to all things with which it comes in contact; it is peculiarly calculated for the drawer, writing-desk, &c.; since its aroma is totally unmingled with that most disagreeable effluvium, which is ever proceeding from alcohol.— The Mirror of Literature, Amusement, and Instruction Volume 12, No. 334, October 4, 1828
It expresses the odour or effluvium which is constantly issuing from every animal, and especially when that animal is in more than usual exercise.— The Dog
They allow rotten timber to accumulate, and stagnant pools to remain about their houses, and from these there arises an effluvium which is most unpleasant in warm weather, which, however, they do not seem to perceive.— A Ramble of Six Thousand Miles through the United States of America
Effluvium has been looked up 383 times, favorited 3 times, listed 53 times, and commented on once.

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about once a year.
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