from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A funnel-shaped device used to direct and amplify the voice.
  • noun A bullhorn.
  • transitive & intransitive verb To transmit (a message) or speak through a megaphone.

from The Century Dictionary.

  • noun An instrument devised by Edison for assisting hearing, adapted for use by deaf persons or for the perception of ordinary sounds at great distances.
  • noun A large speaking-trumpet of a conical form.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A device to magnify sound, or direct it in a given direction in a greater volume, as a very large funnel used as an ear trumpet or as a speaking trumpet.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A portable, usually hand-held, funnel-shaped device that is used to amplify a person’s natural voice toward a targeted direction.
  • verb transitive, intransitive To use a megaphone.
  • noun organic chemistry a cytotoxic neolignan obtained from the laurel aniba megaphylla

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a cone-shaped acoustic device held to the mouth to intensify and direct the human voice


from Wiktionary, Creative Commons Attribution/Share-Alike License

From mega- +‎ phone.


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  • 1 megaphone = 10^^12 microphones

    February 23, 2008