/ Dictionary / Index P periblem: Meaning and Definition of Find definitions for: per•i•blem Pronunciation: (per'u-blem"), [key] — n. Bot. the histogen in plants that gives rise to the cortex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. periastron pericardial Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language