/ Dictionary / Index T tapetum: Meaning and Definition of Find definitions for: ta•pe•tum Pronunciation: (tu-pē'tum), [key] — pl. -ta a layer of cells often investing the archespore in a developing sporangium and absorbed as the spores mature. any of certain membranous layers or layered coverings, as in the choroid of the eyes of certain animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tape transport tapeworm Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language