# opacous

> English word · Adjective

## Definitions
1. Not shining or illuminated; dark.
2. Not allowing the passage of light; opaque.

## Etymology
From Latin opacus (“shaded, shady, dark”) + -ous.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/opacous