From Latin opacus (“shaded, shady, dark”), itself of unknown origin; introduced in the 17th century.
"opacous." YourDictionary, n.d. Web. 10 December 2018. <https://www.yourdictionary.com/opacous>.
opacous. (n.d.). Retrieved December 10th, 2018, from https://www.yourdictionary.com/opacous
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