from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A radio or radar transmitter-receiver activated for transmission by reception of a predetermined signal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a radio or radar transceiver that transmits some signal in response to receiving a predetermined signal
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. electrical device designed to receive a specific signal and automatically transmit a specific reply
tran(smitter) + (re)sponder.(American Heritage® Dictionary of the English Language, Fourth Edition)
Blend of transmitter and responder (Wiktionary)