/ Dictionary / Index A abscission layer: Meaning and Definition of Find definitions for: abscis'sion lay"er Pronunciation: [key] — Bot. Bot. the layer of specialized, cutinized parenchyma cells that develops in the abscission zone, the disintegration of which causes abscission. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. abscission abscission zone Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language