earphone

[ eer-fohn ]

/ ˈɪərˌfoʊn /

a sound receiver that fits in or over the ear, as of a radio or telephone.

Usually earphones. a headset; headphone.

Origin of earphone

First recorded in 1920–25; ear¹ + phone¹

In the Philippines, during Apocalypse, Brando had an earphone thing where they fed him lines.

Robert Duvall on His Storied Career, His New Movie, and Why He’s Ditching the GOP |Marlow Stern |March 13, 2014 |DAILY BEAST
Rick fell back and grabbed his radio unit, quickly plugging in the earphone.

The Pirates of Shan |Harold Leland Goodwin
He pulled a radio sender and receiver from a cabinet and held an earphone close to his temple, continuing to nod.

Cerebrum |Albert Teichner
The better way, though, is to buy an earphone made especially for wireless work.

The Radio Amateur's Hand Book |A. Frederick Collins

He could hear the mumble of voices through the earphone but could make no sense out of it.

The Flaming Mountain |Harold Leland Goodwin
Crag called experimentally into the earphone, without answer.

First on the Moon |Jeff Sutton

earphone

/ (ˈɪəˌfəʊn) /

a device for converting electric currents into sound waves, held close to or inserted into the ear