/ Dictionary / Index L listeria: Meaning and Definition of Find definitions for: lis•te•ri•a Pronunciation: (li-stēr'ē-u), [key] — n. Bacteriol. any of several rod-shaped, aerobic, parasitic bacteria of the genus Listeria, pathogenic for humans and animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: listeria (Thesaurus) listerellosis listeriosis Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language