Daily Almanac for
Nov 28, 2009
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ra•dar



Pronunciation: (rā'där), [key]
n. Electronics.
a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

radradar astronomy
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