tannoy

Etymology
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.

Noun

 * 1)  A public address system.

Verb

 * 1)  To transmit, or communicate with, by means of a public address system.