The Collaborative International Dictionary of English v.0.48:

Thrower \Throw"er\ (thr[=o]"[~e]r), n.
   One who throws. Specifically:
   (a) One who throws or twists silk; a throwster.
   (b) One who shapes vessels on a throwing engine.
       [1913 Webster]

WordNet (r) 3.0 (2006):

thrower
    n 1: a person who twists silk or rayon filaments into a thread
         or yarn [syn: throwster, thrower]
    2: someone who projects something (especially by a rapid motion
       of the arm)
    3: a craftsman who shapes pottery on a potter's wheel and bakes
       them it a kiln [syn: potter, thrower, ceramicist,
       ceramist]