/ Dictionary / Index E endocranium: Meaning and Definition of Find definitions for: en•do•cra•ni•um Pronunciation: (en"dō-krā'nē-um), [key] — pl. -ni•a the inner lining membrane of the skull; the dura mater. the inside surface of the skull. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: endocranium (Thesaurus) endocranial cast endocrine Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language