Latin opācus

→ English ubac (derived)

→ Catalan opac (derived)

→ Catalan obac (inherited)

→ Spanish bacio (inherited(es/it))

→ Spanish opaco (derived)

→ French opaque (borrowed)

→ French ubac (derived)

→ Italian opaco (derived)

→ Latin opacitas (affix)

→ Portuguese opaco (derived)