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 device that converts electric signals, as from a telephone, stereo, or radio receiver, to audible sound and fits over or in the ear. Also called earpiece.

n. A transducer that converts electric signals into sound and is held near the ear, especially as part of a telephone; an earpiece or headphone.

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

"The time has come for men and women of good will to begin playing an exciting new game called earphone keggling."

electro-acoustic transducer   

earbud   

telephone receiver    receiver    earplug   

headphone    headset    earpiece    microphone    headsets    loudspeaker    transceiver    arsenide    eight-position    mikeynth