inter-phone

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
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