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 receiver, as for a telephone, radio, or stereo, held to the ear by a headband.

n. A listening device placed or worn in the ear, usually sold in pairs

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

"Razer has moved to an open-back, ear-encompassing headphone, which is good for those of us who don't like stuff actually sitting on our ears, and I personally think it helps with sound placement as well."

electro-acoustic transducer   

telephone receiver    receiver    earplug   

headset    earphone    headsets    microphone    earpiece    adapters    stereo-    turntable    connector    Bluetooth