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pinger

 - 2 dictionary results
ping·er   (pĭng'ər)   
n.  A device used underwater to produce pulses of sound, as for an echo sounder.
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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pinger

noun
a pulse generator used for echo sounding in sonar 
WordNet® 3.0, © 2006 by Princeton University.
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