1. 
   earphone
   [n] - electro-acoustic transducer for converting electric signals into sounds
   Found op http://www.webdictionary.co.uk/definition.php?query=earphone
   
   
2. 
   earphone
   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`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=earphone
   
   
3. 
   earphone
   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 ...
   Found op http://www.britannica.com/eb/a-z/e/2
   
   
4. 
   earphone
   earphone Any device that converts electrical energy into sound waves and is worn over or inserted into the auditory opening; such as the ear.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2737/4
   
   
5. 
   earphone
   electroacoustic transducer by which acoustic oscillations are obtained from electric signals and intended to be closely coupled acoustically to the ear
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=801-27-18
   
   
6. 
   earphone
   1) Cell accessory 2) Earpiece 3) Electro-acoustic transducer 4) Headphone 5) Headphones 6) Headset 7) Headset piece 8) Kind of jack 9) Phone 10) Recording studio prop 11) Walkman part 12) Walkman plug-in
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/earphone/1
   
   

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