/ Dictionary / Index D deciduous: Meaning and Definition of Find definitions for: de•cid•u•ous Pronunciation: (di-sij'-us), [key] — adj. shedding the leaves annually, as certain trees and shrubs. falling off or shed at a particular season, stage of growth, etc., as leaves, horns, or teeth. not permanent; transitory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: deciduous (Thesaurus) deciduitis deciduous tooth Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language