megaphone

A funnel-shaped device used to direct and amplify the voice.

A bullhorn.

To transmit (a message) or speak through a megaphone.

A large speaking-trumpet of a conical form.

An instrument devised by Edison for assisting hearing, adapted for use by deaf persons or for the perception of ordinary sounds at great distances.

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.

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

To use a megaphone.

a cytotoxic neolignan obtained from the laurel aniba megaphylla

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