/ Dictionary / Index P plane iron: Meaning and Definition of Find definitions for: plane' i"ron Pronunciation: [key] — Carpentry. Carpentry. the blade of a plane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plane geometry plane of incidence 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