Source : Webster's Revised Unabridged Dictionary (1913)

Chuck \Chuck\ (ch[u^]k), n.
   1. A small pebble; -- called also {chuckstone} and
      {chuckiestone}. [Scot.]

   2. pl. A game played with chucks, in which one or more are
      tossed up and caught; jackstones. [Scot.]