/ Dictionary / Index L leucaena: Meaning and Definition of Find definitions for: leu•cae•na Pronunciation: (l-sē'nu), [key] — n. any of various tropical trees belonging to the genus Leucaena, of the legume family, which includes the lead tree. Cf. ipil-ipil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: leucaena (Thesaurus) leuc- Leucas Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language