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. [Webster 1913 Suppl.]
A size of photograph a little larger than a postage stamp. [Webster 1913 Suppl.]
ping-pong, v. i.
To play ping-pong. [Webster 1913 Suppl.]
to bounce back and forth, in the manner of a ping-pong ball. [PJC]