IPA: /ˈɪəpiːs/
KK: /ˈɪrˌpis/
A small device that fits in or near the ear, often used for listening to sound from a phone or other audio device.
She wore an earpiece to listen to the instructions during the meeting.
Earpiece is formed from "ear" (from Old English "eare", meaning the organ of hearing) and "piece" (from Old French "piece", meaning a part or fragment). The word "earpiece" refers to a part that is designed to be placed in or on the ear, typically for listening purposes.
Think of the 'ear' as the organ for hearing and 'piece' as a part — an earpiece is a part that fits in or on your ear for listening.