Breadcrumb Home > Dictionary > Index L leucoblast: Meaning and Definition of Find definitions for: leu•co•blast Pronunciation: (l'ku-blast"), [key] — n. leukoblast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leuco base leucocratic ✖ Related Content Daily Word Quiz: donnybrook Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language