The story
- Latinopacus
- Middle Englishopake
- Middle Frenchopaqueinflu.
- English todayopaque
From Middle English opake, from Latin opacus (“shaded, shady, dark”) (of unknown origin), later reinforced from Middle French opaque. Doublet of ubac.
Words from the same roots
Etymology from Wiktionary, CC BY-SA 4.0.