transponder
tran·spon·der
noun \tran(t)-ˈspän-dər\Definition of TRANSPONDER
: a radio or radar set that upon receiving a designated signal emits a radio signal of its own and that is used especially for the detection, identification, and location of objects and in satellites for relaying communications signals
See Origin of TRANSPONDER
transmitter + responder
First Known Use: circa 1944
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