megaphone

• (UK) IPA^(key): /ˈmɛɡ.əˌfəʊn/
• (General American) IPA^(key): /ˈmɛɡəˌfoʊn/

From mega- +‎ -phone.

A swim lifeguard speaking through a megaphone

megaphone (plural megaphones)

1. A portable, usually hand-held, funnel-shaped device that is used to amplify a person’s natural voice toward a targeted direction.
2. (figuratively) Mouthpiece or promoter; one who speaks for or publicizes on behalf of another.
   • 2018 June 6, Arwa Mahdawi, “Michael Pack: the Bannon ally critics fear will become Trump's global propagandist”, in The Guardian‎:

     If Pack does become head of the BBG, critics fear that he will turn Voice of America and the other BBG networks into a megaphone for Trump.

• speaking trumpet

• loudhailer, blowhorn

• bullhorn, the modern electronic amplification version

• megaphonic
• megaphonist

megaphone (third-person singular simple present megaphones, present participle megaphoning, simple past and past participle megaphoned)

1. (transitive, intransitive) To use a megaphone; to speak through a megaphone.

Named for the root Aniba megaphylla +‎ -one.

megaphone (uncountable)

1. (organic chemistry) a cytotoxic neolignan obtained from the laurel Aniba megaphylla.