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radon
ra·don [ ráy dòn ]


noun 
Definition:
 
radioactive element: a heavy gaseous radioactive element. Source: radioactive decay of radium, in small quantities in rock and soil. Use: radiotherapy.
Symbol  Rn
[Early 20th century. <radium]
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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