e·mit·ter

[ih-mit-er]
noun
1.
a person or thing that emits.
2.
Electronics. an electrode on a transistor from which a flow of electrons or holes enters the region between the electrodes.

Origin:
1880–85; emit + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
emitter (ɪˈmɪtə) [Click for IPA pronunciation guide]
 
n
1.  a person or thing that emits
2.  a radioactive substance that emits radiation: a beta emitter
3.  the region in a transistor in which the charge-carrying holes or electrons originate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Emitter is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
Example sentences
In particle motion the traveling particle requires no medium, and its speed is
  fixed relative to its emitter.
The country is also the world's biggest emitter of sulphur dioxide.
The reflected light carries energy that helps keep the emitter hot, reducing
  the amount of fuel needed.
Without any need for an emitter, a receiver could be designed to take pictures
  in the terahertz range.
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