ping-pong ball

from WordNet (r) 3.0 (2006)
ping-pong ball
    n 1: light hollow ball used in playing table tennis
from The Collaborative International Dictionary of English v.0.48
Ping-pong ball \Ping"-pong ball`\, v. i.
   the small hollow celluloid ball used for the game of
   ping-pong.
   [PJC]
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