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transponder

 - 3 dictionary results

tran⋅spon⋅der

[tran-spon-der]
–noun
a radio, radar, or sonar transceiver that automatically transmits a signal upon reception of a designated incoming signal.
Also, tran⋅spon⋅dor.


Origin:
1940–45; trans(mitter) + (res)ponder
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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tran·spond·er   (trān-spŏn'dər)   
n.  A radio or radar transmitter-receiver activated for transmission by reception of a predetermined signal.

[tran(smitter) + (re)sponder.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

transponder 
1945, from trans(mit) + (res)pond + -er
Online Etymology Dictionary, © 2001 Douglas Harper
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