/ Dictionary / Index M myeloblast: Meaning and Definition of Find definitions for: my•e•lo•blast Pronunciation: (mī'u-lu-blast"), [key] — n. Cell Biol. an immature myelocyte. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: myeloblast (Thesaurus) myelo- myelocyte Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language