Wiktionary
a. Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit. alt. Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit. n. 1 A telephone with buttons that produce tones, one for each digit. 2 A tone produced by such a telephone.
Usage examples of "touch-tone".
Why couldn't Beulah have a touch-tone phone instead of the slow black rotary phone?
In the bottom of its white plastic liner was a pile of dull blue dust, all that was left of a powder blue Princess phone with touch-tone dialing.
Remo ran quickly behind O'Donnell's desk, picked up the telephone and jabbed the touch-tone numbers, four-oh-seven-seven.
There are a couple of clicks, a sequence of faraway noises like touch-tones and a faint, barely audible echo: '.
In Saudi Arabia, they disabled touch-tones upon connection so our users were unable to place calls when the callback arrived - so we instituted a sophisticated voice recognition system - customer service reps who listened to our customers speaking the number and keyed it into the system.