Webster's English Dictionary

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radar

ra.dar \'ra--.da:r\ \-m*n, -.man\ n [radio detecting and ranging] : a radio 
   device or system for locating an object by means of ultrahigh-fr equency 
   radio waves reflected from the object and received, observed, and analyzed 
   by the receiving part of the device in such a way that characteristics (as 
   distance and direction) of the object may be determined - ra.dar.man n