Etymology

opacous

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Today it means: Not shining or illuminated; dark. Full definition →

First used 17th–20th c.Latin opācus
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The story

  1. Latin · derived fromopācus“shaded, shady, dark”
  2. English todayopacous

From Latin opācus (“shaded, shady, dark”) + -ous.

Words from the same roots

Latinopācus all →

opaqueopacifyubac

First known use, by meaning

  • 17th–20th c. Not shining or illuminated; dark.
  • 17th–19th c. Not allowing the passage of light; opaque.

Etymology from Wiktionary, CC BY-SA 4.0.