WordReference Random House Learner's Dictionary of American English © 2015
bull•horn or bull horn/ˈbʊlˌhɔrn/USA pronunciation   n. [countable]

    a high-powered, electrical loudspeaker:Talking through the bullhorn, the detective persuaded the gunman to surrender.

WordReference Random House Unabridged Dictionary of American English © 2015
bull•horn  (bŏŏlhôrn′), 

    a directional, high-powered, electrical loudspeaker or megaphone.
Also,bull horn′. 
  • bull1 + horn 1950–55

Collins Concise English Dictionary © HarperCollins Publishers::

bullhorn /ˈbʊlˌhɔːn/ n
  1. US Canadian a portable loudspeaker having a built-in amplifier and microphone
    Also called (in Britain and certain other countries): loud-hailer

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