From WordNet (r) 3.0 (2006) [wn]:
Ping-Pong
n 1: a game (trademark Ping-Pong) resembling tennis but played
on a table with paddles and a light hollow ball [syn:
table tennis, Ping-Pong]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
ping-pong \ping"-pong`\, n. [Imitative.]
1. An indoor modification of lawn tennis played with small
bats, or battledores, and a very light, hollow, celluloid
ball, on a large table divided across the middle by a net.
Also called table tennis. [[originally a trade name]
[Webster 1913 Suppl. +PJC]
2. A size of photograph a little larger than a postage stamp.
[Webster 1913 Suppl.]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ping-pong \Ping"-pong`\, v. i.
1. To play ping-pong.
[Webster 1913 Suppl.]
2. to bounce back and forth, in the manner of a ping-pong
ball.
[PJC]
From The Free On-line Dictionary of Computing (8 July 2008) [foldoc]:
ping-pong
<architecture> A phenomenon which can occur in a
multi-processor system with private caches where two
processors are alternately caching a shared location. Each
time one writes to it, it invalidates the other's copy.
(1995-12-29)