/ Dictionary / Index P periderm: Meaning and Definition of Find definitions for: per•i•derm Pronunciation: (per'i-dûrm"), [key] — n. the cork-producing tissue of stems together with the cork layers and other tissues derived from it. epitrichium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. peridental membrane peridium Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language