bull·horn

[bool-hawrn]
noun
a directional, high-powered, electrical loudspeaker or megaphone.
Also, bull horn.


Origin:
1950–55; bull1 + horn

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
bullhorn (ˈbʊlˌhɔːn) [Click for IPA pronunciation guide]
 
n
(US), (Canadian) Also called (in Britain and certain other countries): loud-hailer a portable loudspeaker having a built-in amplifier and microphone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Bullhorn is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
He stood up on a pile of rubble with a bullhorn in his hand.
He had a bullhorn but for some reason he wasn't using it.
It could be by yelling out through a bullhorn or even making a telephone call
  to the people inside.
The device can be equipped with either a headset or an adjustable gooseneck
  microphone and has a bullhorn jack.
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