touch-tone

Etymology
From the trade name, 1960.

Adjective

 * 1) Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit.

Noun

 * 1) A telephone with buttons that produce tones, one for each digit.
 * a teleconference service for touch-tones only
 * 1) A tone produced by such a telephone.
 * software to decode touch-tones