/ Dictionary / Index E effluvium: Meaning and Definition of Find definitions for: ef•flu•vi•um Pronunciation: (i-fl'vē-um), [key] — pl. -vi•a -vi•ums. a slight or invisible exhalation or vapor, esp. one that is disagreeable or noxious. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: effluvium (Thesaurus) effluent efflux Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language