[tel-i-tahyp-rahy-ter, tel-i-tahyp-]
a telegraphic apparatus by which signals are sent by striking the letters and symbols of the keyboard of an instrument resembling a typewriter and are received by a similar instrument that automatically prints them in type corresponding to the keys struck. Abbreviation: TTY

1900–05; tele-1 + typewriter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
teletypewriter (ˌtɛlɪˈtaɪpˌraɪtə, ˈtɛlɪˌtaɪp-)
a US name for teleprinter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

teletypewriter definition

(Nearly always abbreviated to "teletype" or "tty") An obsolete kind of terminal, with a noisy mechanical printer for output, a very limited character set, and poor print quality.
See also bit-paired keyboard.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
They built it as a teletypewriter system and tested it.
From the far side of the encryption device, a sheet of teletypewriter paper began to emerge.
The tax on teletypewriter exchange service does not apply to charges for the following news services.
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