touch-tonePronunciation: (tuch'tōn"), [key]
of or pertaining to a tone-dialing system or a push-button phone operating on tone dialing.
1. (sometimes cap.)
a tone-dialing system.
a telephone utilizing this system. Also,touch'tone".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.