/ Dictionary / Index L leukoblast: Meaning and Definition of Find definitions for: leu•ko•blast Pronunciation: (l'ku-blast"), [key] — n. Cell Biol. an immature leukocyte. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leuko- leukocyte Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language