(n.) One who, or that which, transmits; specifically, that portion of a telegraphic or telephonic instrument by means of which a message is sent; -- opposed to receiver.

AM transmitter FM transmitter RT transmitter TelAutography Teletype Teletype network Teletyping amateur transmitter beacon call box closed-circuit telegraphy code coin telephone desk telephone dial telephone duplex telegraphy electricity extension facsimile telegraph fan marker interrupter key microphone mouthpiece multiplex telegraphy news ticker pay station phone public telephone push-button telephone quadruplex telegraphy radiator radio beacon radio range beacon radio transmitter radiomicrophone radiosonde railroad telegraphy receiver sender simplex telegraphy single-current telegraphy sounder stock ticker submarine telegraphy telegraphics telegraphy telephone telephone booth telephone engineering telephone extension telephone mechanics telephone receiver telephonics telephony teleprinter teletypewriter teletypewriting televisor telex ticker transceiver typotelegraph typotelegraphy video transmitter wall telephone wire service