opaque
Stedman's Medical Dictionary: A Practical Medical Dictionary · 1920 · p. 24
(o-pak') [Fr.; L. opacus, shady.] Impervious to light, not translucent or only slightly so.
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Chamber's Etymological of the English Language (1895)
International Cyclopedia of Practical Knowledge (1895)
An Illustrated Encyclopedic Medical Dictionary (1894)
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