The Collaborative International Dictionary of English v.0.48:
Plyer \Ply"er\, n. One who, or that which, plies; specifically: (a) pl. A kind of balance used in raising and letting down a drawbridge. It consists of timbers joined in the form of a St. Andrew's cross. (b) pl. See Pliers. [1913 Webster]WordNet (r) 3.0 (2006):
plyer n 1: someone who plies a trade [syn: plier, plyer]