/ Dictionary / Index D dura mater: Meaning and Definition of Find definitions for: du'ra ma'ter Pronunciation: (mā'tur), [key] — Anat. Anat. the tough, fibrous membrane forming the outermost of the three coverings of the brain and spinal cord. Also calledCf. arachnoid (def. 6), Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. duralumin duramen Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language