Impervious to light; not translucent or only slightly so. Cf.:radiopaque. [Fr. fr. L. opacus, shady]
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opaque ō-'pāk adj exhibiting opacity: not pervious to radiant energy
opaque·ness n
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(o-pākґ) [L. opacus dark] impervious to light rays, or by extension to x-rays or other electromagnetic radiations; neither transparent nor translucent.Medical dictionary. 2011.