/ Dictionary / Index M medullated: Meaning and Definition of Find definitions for: med•ul•lat•ed Pronunciation: (med'l-ā"tid, mej'u-lā"-, mu-dul'ā-tid), [key] — adj. Anat. myelinated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: medullated (Thesaurus) medullary sheath medullation Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language