/ Dictionary / Index L leptospira: Meaning and Definition of Find definitions for: lep•to•spi•ra Pronunciation: (lep"tu-spī'ru), [key] — pl. -rae -ras. any of several spirally shaped, aerobic bacteria of the genus Leptospira, certain species of which are pathogenic for human beings. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: leptospira (Thesaurus) leptospermum leptospirosis Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language