from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A usually hand-held device that measures the velocity of a moving object by sending out a continuous radio wave and measuring the frequency of reflected waves.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hand-held (or mounted) device that uses the Doppler effect and a radar beam to measure the velocity of moving objects (especially traffic)


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