/ Dictionary / Index E echovirus: Meaning and Definition of Find definitions for: ech•o•vi•rus Pronunciation: (ek'ō-vī"rus), [key] — pl. -rus•es. any of numerous retroviruses of the picornavirus group, some harmless and others associated with various human disorders, as aseptic meningitis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: echovirus (Thesaurus) echo question echt* Related Content Daily Word Quiz: frowzy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language