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radius of action
radius of curvature
radius vector
radix
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radome
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radiotherapy
ra·di·o·ther·a·py [ ràydee ō thérrəpee ]


noun 
Definition:
 
medical treatment using radiation: the treatment of disease using radiation X-rays or beta rays directed at the body from an external source or emitted by radioactive materials placed within the body

ra·di·o·ther·a·peu·tic [ ràydee ō thèrrə pytik ] adjective
ra·di·o·ther·a·pist [ ràydee ō thérrəpist ] noun
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