Meaning of radar

ra•dar

Pronunciation: (rā'där), [key]
— n. Electronics.
  1. 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.
See also:
rad radar astronomy