radar beacon definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a beacon with its transmitter and other components that emits radar waves for reception and display, indicating its range or bearing, or both, from a receiving set: it is usually a transponder that returns coded signals only when triggered by a specific radar pulse
radar beacon definition by American Heritage Dictionary
A fixed device that sends or receives, amplifies, alters, and returns a radar signal, permitting a distant receiver to determine its bearing and sometimes its range.