telecommunications device for the deaf

(redirected from Text-based telephone)
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tel·e·com·mu·ni·ca·tions de·vice for the deaf

(TDD, TT) (tel'ĕ-kŏ-myū'ni-kā'shŭns dĕ-vīs' def)
Telephone accessory that transmits and receives text over standard telephone lines. Also referred to as teletypewriter (TTY) and text telephone (TT).
See also: assistive listening device
References in periodicals archive ?
When I first started working for Merrill Lynch in 1987, I used a text-based telephone (TTY).
Gerbasi experiences difficulty when using a text-based telephone (TTY) and computer messaging because of his low vision and limited computer skills.