Ra″di‐o‐graph (rā″dĭ‐ō̍‐grăf), n. [Radio- + -graph.] (Phys.) A picture produced by the Röntgen rays upon a sensitive surface, photographic or fluorescent, especially a picture of opaque objects traversed by the rays.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.