telecommunications device for the deaf

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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 ?
It is important to note that although deaf people can use telephones which are equipped with a Telecommunications Device for the Deaf (TDD), only one graduate said his company provides a TDD for deaf employees.
A hearing-impaired person could type messages into an existing telecommunications device for the deaf, and the TND would translate the typed messages into synthesized voice.
A Telecommunications Device for the Deaf (TDD) carries conversation typed into a keyboard over telephone lines and displays it on the receiving TDD.

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