/ Dictionary / Index E endothecium: Meaning and Definition of Find definitions for: en•do•the•ci•um Pronunciation: (en"dō-thē'shē-um, -sē-um), [key] — pl. -ci•a the lining of the cavity of an anther. (in mosses) the central mass of cells in the rudimentary capsule, from which the archespore is generally developed. (in bryophytes) the central mass of cells in the capsule, including the spores and columella. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. endosymbiosis endothelioid Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language