interphone

[in-ter-fohn]
noun
1.
an intercommunication system using telephones to connect offices, stations, etc., as in a building or ship; intercom.
2.
a telephone used in such a system.

Origin:
1940–45; formerly trademark

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
interphone (ˈɪntəˌfəʊn)
 
n
a telephone system for linking different rooms within a building, ship, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Use only within your facility, not on data or interphone circuits.
The interphone capability is an integral part of this procedure when approach control has the sole separation responsibility.
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