/ Dictionary / Index P plater: Meaning and Definition of Find definitions for: plat•er Pronunciation: (plā'tur for 2 also plat'ur), [key] — n. a person or thing that plates. an inferior race horse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plater (Thesaurus) plate proof plate rail Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language