a person or thing that emits.
Electronics. an electrode on a transistor from which a flow of electrons or holes enters the region between the electrodes.

1880–85; emit + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
emitter (ɪˈmɪtə)
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
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Example sentences
In particle motion the traveling particle requires no medium, and its speed is
  fixed relative to its emitter.
But even for a beta emitter, tritium is extremely low energy.
German researchers have identified a previously unknown emitter of methane, a
  potent greenhouse gas.
Applying a voltage to the base permits the flow of current from emitter to
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