/ Dictionary / Index L leucoplast: Meaning and Definition of Find definitions for: leu•co•plast Pronunciation: (l"ku-plast"), [key] — n. Bot. a colorless plastid in the cells of roots, storage organs, and underground stems, serving as a point around which starch forms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leucoplakia leucopoiesis Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language