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rad.
RADA
radar
radar astronomy
radar beacon
radar gun
radar screen
radar trap
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raddle (1)
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radiant energy
ra·di·ant en·er·gy


noun 
Definition:
 
electromagnetic waves: energy emitted as waves, usually electromagnetic waves, through space or some other medium.
Symbol  Qe
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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