Search Result for "megaphone": 
Wordnet 3.0

NOUN (1)

1. a cone-shaped acoustic device held to the mouth to intensify and direct the human voice;


The Collaborative International Dictionary of English v.0.48:

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]
WordNet (r) 3.0 (2006):

megaphone n 1: a cone-shaped acoustic device held to the mouth to intensify and direct the human voice