/ Dictionary / Index D deciduate: Meaning and Definition of Find definitions for: de•cid•u•ate Pronunciation: (di-sij'-it), [key] — adj. Anat., Zool. having or characterized by a decidua. (of a placenta) partly formed from the decidua. deciduous (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decidua deciduitis Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language