1) Bit of Secret Service gear 2) Cell accessory 3) Device for private listening 4) Earpiece 5) Electro-acoustic transducer 6) Headphone 7) Headphones 8) Headset 9) Headset part 10) Headset piece 11) Kind of jack 12) MP3 player attachment 13) Phone 14) Recording studio prop 15) Walkman part 16) Walkman plug-in 1) Earpiece 2) Headphone 
small loudspeaker held or worn close to the listener`s ear or within the outer ear. Common forms include the hand-held telephone receiver; the ...
electroacoustic transducer by which acoustic oscillations are obtained from electric signals and intended to be closely coupled acoustically to the ear
[n] - electro-acoustic transducer for converting electric signals into sounds
earphone Any device that converts electrical energy into sound waves and is worn over or inserted into the auditory opening; such as the ear.
earpiece noun electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear; `it was not the typing but the earphones that she disliked`