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radiosonde
radiostrontium
radiotelephone
radioteletype
radiotherapy
radiothorium
radiotoxic
radiotracer
radish
radium
radium therapy
radius
radius of action
radius of curvature
radius vector
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radiopaque
ra·di·o·paque [ ràydee ō páyk ]


adjective 
Definition:
 
not penetrable by electromagnetic radiation: blocking the passage of X-rays and other forms of electromagnetic radiation

ra·di·o·pac·i·ty [ ràydee ō pássətee ] noun
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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