/ Dictionary / Index A amphithecium: Meaning and Definition of Find definitions for: am•phi•the•ci•um Pronunciation: (am"fu-thē'shē-um), [key] — pl. -ci•a the layer or one of the layers of cells in the capsule of a moss surrounding the spores. (in certain lichens) a layer of cells that surrounds the fungal apothecium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. amphitheater Amphithemis Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language