/ Dictionary / Index P plate armor: Meaning and Definition of Find definitions for: plate' ar"mor Pronunciation: [key] armor made of thin, flat, shaped pieces of wrought iron or steel. any armor composed of, or having as an exterior surface, tough, stiff, flat pieces, large or small, of various materials, as iron, steel, or horn. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plate plateau 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