/ Dictionary / Index L Legionella*: Meaning and Definition of Find definitions for: Le•gion•el•la Pronunciation: (lē"ju-nel'u), [key] — n. a genus of rod- or coccus-shaped aerobic Gram-negative bacteria, certain species of which, as L. pneumophila, produce legionnaires' disease. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. legionary ant legionnaire Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language