opacous

adjective

1. Not shining or illuminated; dark.

   obsolete

   The firm opacous Globe / Of this round World, whose first convex divides / The luminous inferior Orbs.

2. Not allowing the passage of light; opaque.

   obsolete

   And vve particularly remember, that, being at ſome diſtance from London one Night, that the People, upon a very vvell-come Occaſion, teſtified their Joy by numerous Bon-fires; though, by reaſon of the Interpoſition of the Houſes, vve could not ſee the Fires themſelves, yet vve could plainly ſee the Air all enlighten'd over and near the City; vvhich argu'd, that the lucid Beams ſhot upvvards from the Fires, met in the Air with the Corpuſcles opacous enough to reflect them to our Eyes.

Where it comes from

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

Adapted from the Wiktionary entry opacous (CC BY-SA 4.0).

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