This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A part, as of a telephone receiver or hearing aid, that fits in or is held next to the ear.

n. See earphone.

n. Either of the two parts of an eyeglasses frame that extend over or around the ear.

n. A speaker placed inside or held near to the ear.

n. The arm on a pair of glasses that hooks over the ear to hold them in place.

n. a device for converting electric signals into sounds, designed to be held over or inserted into the ear.

n. A name given to the side-piece of the burganet or open helmet of the sixteenth century, usually made of splints, and covering a leather strap or chin-band to which they are riveted. Compare cheek-piece. Also called oreillère.

n. electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear

"UPDATE: The main article I link to below has been pulled, so we should assume that the author's allegation, that Romney's staff admits he wears an earpiece, is no longer proven."

electro-acoustic transducer   

telephone receiver    receiver    earplug   

earphone    headphone    phone   

headsets    headset    dongle    mikeynth    earphone    headphone    prolocutor    adapters    radome    fixers