MEGAPHONE

Megaphone

A megaphone, speaking-trumpet, bullhorn, blowhorn, or loud hailer is a portable, usually hand-held, cone-shaped acoustic horn used to amplify a person’s voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves radiate out the wide end. The megaphone increases the volume of sound by increasing the acoustic impedance seen by the vocal cords, matching the impedance of the vocal cords to the air, so that more sound power is radiated. It also serves to direct the sound ...

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megaphone

Noun

  1. A portable, usually hand-held, funnel-shaped device that is used to amplify a person’s natural voice toward a targeted direction.

Noun (etymology 2)

  1. a cytotoxic neolignan obtained from the laurel Aniba megaphylla.

Verb

  1. To use a megaphone.


The above text is a snippet from Wiktionary: megaphone
and as such is available under the Creative Commons Attribution/Share-Alike License.

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