Plat"er (?), n. (Horse Racing) A horse that runs chiefly in plate, esp. selling-plate, races; hence, an inferior race horse.

Plat"er (?), n. One who plates or coats articles with gold or silver; as, a silver plater.

2. A machine for calendering paper.

Plat"er (?), n. (Horse Racing) A horse that runs chiefly in plate, esp. selling-plate, races; hence, an inferior race horse.