plater n 1: a skilled worker who coats articles with a film of metal (usually silver or gold)
Plater \Plat"er\, n. One who plates or coats articles with gold or silver; as, a silver plater. [1913 Webster] 2. A machine for calendering paper. [1913 Webster]
Plater \Plat"er\, n. (Horse Racing) A horse that runs chiefly in plate, esp. selling-plate, races; hence, an inferior race horse. [Webster 1913 Suppl.]