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 ?
Hearing-impaired customers with Telecommunications Devices for the Deaf can call 711.
TRS enables callers with hearing and speech disabilities who use telecommunications devices for the deaf (TDD, which also served to update the acronym TTY), which are also known as teletypewriters, or TTYs, and callers who use voice telephones to communicate with one another through a third-party communications assistant.

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