/ Dictionary / Index M myelinated: Meaning and Definition of Find definitions for: my•e•li•nat•ed Pronunciation: (mī'u-lu-nā"tid), [key] — adj. Anat. (of a nerve) having a myelin sheath; medullated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: myelinated (Thesaurus) myelin myelination Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language