transponder
trans·pon·der
noun
1.
electrical device designed to receive a specific signal and automatically transmit a specific reply
Origin
Blend of transmitter + responder.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.