/ Dictionary / Index L leptospermum: Meaning and Definition of Find definitions for: lep•to•sper•mum Pronunciation: (lep"tu-spûr'mum), [key] — n. any of various shrubs or trees of the genus Leptospermum, of the myrtle family, native to Australia and adjacent areas and often cultivated as ornamentals in milder climates. Cf. tea tree. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leptosome leptospira 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