/ Dictionary / Index M myel-: Meaning and Definition of Find definitions for: myel- Pronunciation: [key] var. ofbefore a vowel: myelitis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mydriatic myelencephalon Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language