'Megaphone' definitions:
Definition of 'megaphone'
From: WordNet
noun
A cone-shaped acoustic device held to the mouth to intensify and direct the human voice
Definition of 'Megaphone'
From: GCIDE
- Megaphone \Meg"a*phone\, n. [Mega- + Gr. fwnh` voice.] 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. [1913 Webster]