bullhorn

or bull horn

[ boo l-hawrn ]
/ ˈbʊlˌhɔrn /

noun

a directional, high-powered, electrical loudspeaker or megaphone.

Origin of bullhorn

First recorded in 1950–55; bull1 + horn
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for bullhorn

bullhorn

/ (ˈbʊlˌhɔːn) /

noun

US and Canadian a portable loudspeaker having a built-in amplifier and microphoneAlso called (in Britain and certain other countries): loud-hailer

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012