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radiopaque

[rey-dee-oh-peyk]
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adjective
  1. opaque to radiation; visible in x-ray photographs and under fluoroscopy (opposed to radiotransparent).
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Compare radiolucent.

Origin of radiopaque

First recorded in 1925–30; radi(o)- + opaque
Related formsra·di·o·pac·i·ty [rey-dee-oh-pas-i-tee] /ˌreɪ di oʊˈpæs ɪ ti/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for radiopacities

radiopaque

radio-opaque

adjective
  1. not permitting X-rays or other radiation to pass through
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Derived Formsradiopacity (ˌreɪdɪəʊˈpæsɪtɪ) or radio-opacity, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

radiopacities in Medicine

radiopaque

(rā′dē-ō-pāk)
adj.
  1. Relatively impenetrable by x-rays or other forms of radiation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.