Tannoy definitions

tan
Tannoy is a trademark for a British public address system.

An example of a Tannoy is a way of getting a message out to everyone in a large building in Britain.

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(UK, colloquial) A public address system.
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Origin of tannoy

A genericised trademark of Tannoy Ltd, a manufacturer of public address systems. "Tannoy" is a syllabic abbreviation of tantalum alloy, which was the material used in a type of electrolytic rectifier developed by the company.