Source : Webster's Revised Unabridged Dictionary (1913)

Ninepins \Nine"pins\, n. pl.
   A game played with nine pins, or pieces of wood, set on end,
   at which a wooden ball is bowled to knock them down; bowling.

   Note: In the United States, ten pins are used for this game,
         which is therefore often called tenpins.

Source : WordNet®

ninepins
     n : bowling down an alley at a target of nine wooden pins [syn:
         {skittles}]