Other forms: earpieces
An earpiece is the small speaker worn in one ear. Presenters, security staff and interpreters all have one.
The single ear is the point, since it leaves the other free for the room, which is why broadcasters can hear a director and a guest at the same time. Television has made the coiled wire behind an ear a visual shorthand for security. The word also names the part of a telephone handset you listen through, and the arm of a pair of glasses in some usage.
1nounearpieceA small speaker worn in the ear to receive sound.
“The presenter kept touching her earpiece.”
From ear + piece.
Etymology from Wiktionary, CC BY-SA