transmitter

[trans-mit-er, tranz-]
noun
1.
a person or thing that transmits.
2.
Also called transmitting set. Radio. a device for sending electromagnetic waves; the part of a broadcasting apparatus that generates and modulates the radiofrequency current and conveys it to the antenna.
3.
the part of a telephonic or telegraphic apparatus that converts sound waves or mechanical movements into corresponding electric waves or impulses.
4.
Biochemistry, neurotransmitter.

Origin:
1720–30; transmit + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
transmitter (trænzˈmɪtə)
 
n
1.  a person or thing that transmits
2.  the equipment used for generating and amplifying a radio-frequency carrier, modulating the carrier with information, and feeding it to an aerial for transmission
3.  the microphone in a telephone that converts sound waves into audio-frequency electrical signals
4.  a device that converts mechanical movements into coded electrical signals transmitted along a telegraph circuit
5.  physiol short for neurotransmitter

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
transmitter   (trāns'mĭt-ər)  Pronunciation Key 
A device that converts sound, light, or electrical signals into radio, microwave, or other electrical signals of sufficient strength for the purpose of telecommunication. Compare receiver.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Visual and audio information is relayed back to a research team's base camp via
  radio transmitter for observation and recording.
It's designed to release at a designated time, and can be retrieved using radio
  transmitter tracking.
It would send a signal from the air down to the transmitter to the video deck.
To tap a certain microwave link, your opponents must be in the line of sight of
  the transmitter.
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