transmitter

[trans-mit-er, tranz-]
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noun

a person or thing that transmits.
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.
the part of a telephonic or telegraphic apparatus that converts sound waves or mechanical movements into corresponding electric waves or impulses.
Biochemistry. neurotransmitter.

Origin of transmitter

First recorded in 1720–30; transmit + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for transmitter

transmitter

noun

a person or thing that transmits
the equipment used for generating and amplifying a radio-frequency carrier, modulating the carrier with information, and feeding it to an aerial for transmission
the microphone in a telephone that converts sound waves into audio-frequency electrical signals
a device that converts mechanical movements into coded electrical signals transmitted along a telegraph circuit
physiol short for neurotransmitter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for transmitter
n.

"apparatus for receiving radio signals," 1934, agent noun from transmit.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for transmitter

transmitter

[trănsmĭt-ər]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.