earpiece
noun
ear·piece ˈir-ˌpēs 
1
: the part of an instrument (such as a telephone, stethoscope, or hearing aid) that is placed against or inserted into the outer opening of the ear
especially : earphone
2
: one of the two sidepieces that support eyeglasses by passing over or behind the ears
Example Sentences
the earpiece of a stethoscope
Recent Examples on the Web PitchCom, a device used this season where catchers push buttons to call signs while the pitcher wears an earpiece, may become more of a necessity next year. 
The Enquirer, 10 Sep. 2022 Inside, an earpiece-wearing security guard politely organizes a line snaking through the lobby—a scene more often found outside clubs below 14th Street. Kareem Rashed, Robb Report, 28 Aug. 2022 While watching practice, Burrow was spotted with an earpiece to listen to an exchange between backup quarterback Brandon Allen and Taylor. Kelsey Conway, The Enquirer, 2 Aug. 2022 There are two drivers in each earpiece for the bass frequencies, two for the midrange, plus two more taking care of the treble frequencies. Mark Sparrow, Forbes, 3 Aug. 2022 This draws air through dust-specific filters in the earpiece, then funnels that air toward the nose and mouth (through a bulky-looking pair of cheek-lining plastic pieces, which Dyson says do not touch the face) where further filtration awaits. Sam Machkovech, Ars Technica, 31 Mar. 2022 His handler, Maria (Sandra Bullock), issues his orders through an earpiece: pick up weapons from a station locker, board the Shinkansen to Kyoto, steal a stranger’s briefcase, and exit at the first station. Amy Nicholson, WSJ, 4 Aug. 2022 Because what follows is Saul in all his glory: partying all night, working every minute of the day, barking orders through his earpiece at the increasingly bitter and cynical Francesca. Alan Sepinwall, Rolling Stone, 19 July 2022 The article even claimed Depp had his lines fed to him through an earpiece on recent shoots. Morayo Ogunbayo, ajc, 12 July 2022 See More
The Enquirer, 10 Sep. 2022 Inside, an earpiece-wearing security guard politely organizes a line snaking through the lobby—a scene more often found outside clubs below 14th Street. Kareem Rashed, Robb Report, 28 Aug. 2022 While watching practice, Burrow was spotted with an earpiece to listen to an exchange between backup quarterback Brandon Allen and Taylor. Kelsey Conway, The Enquirer, 2 Aug. 2022 There are two drivers in each earpiece for the bass frequencies, two for the midrange, plus two more taking care of the treble frequencies. Mark Sparrow, Forbes, 3 Aug. 2022 This draws air through dust-specific filters in the earpiece, then funnels that air toward the nose and mouth (through a bulky-looking pair of cheek-lining plastic pieces, which Dyson says do not touch the face) where further filtration awaits. Sam Machkovech, Ars Technica, 31 Mar. 2022 His handler, Maria (Sandra Bullock), issues his orders through an earpiece: pick up weapons from a station locker, board the Shinkansen to Kyoto, steal a stranger’s briefcase, and exit at the first station. Amy Nicholson, WSJ, 4 Aug. 2022 Because what follows is Saul in all his glory: partying all night, working every minute of the day, barking orders through his earpiece at the increasingly bitter and cynical Francesca. Alan Sepinwall, Rolling Stone, 19 July 2022 The article even claimed Depp had his lines fed to him through an earpiece on recent shoots. Morayo Ogunbayo, ajc, 12 July 2022 See More Word History
First Known Use
1824, in the meaning defined at sense 2
Medical Definition
earpiece
noun
ear·piece ˈi(ə)r-ˌpēs
1
: a part of an instrument (as a stethoscope or hearing aid) that is inserted into the outer opening of the ear
2
: one of the two sidepieces that support eyeglasses by passing over or behind the ears