/ Dictionary / Index M myelo-: Meaning and Definition of Find definitions for: myelo- Pronunciation: [key] a combining form meaning “marrow,” “of the spinal cord,” used in the formation of compound words: myelocyte. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. myelitis myeloblast Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language