Plural of earpiece; the parts of headphones, hearing aids, or other audio devices that fit in or on the ear.
From 'ear' plus 'piece' (from Old French 'piece'). The term emerged in the late 1800s as telephone and audio technology created removable components designed specifically for the ear.
The design of earpieces is genuinely difficult—engineers must balance comfort, sound quality, and security while accounting for the fact that every human ear is a different shape, which is why custom earpieces for high-end hearing aids cost hundreds of dollars.
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