Ancient Greek -εινός

← Proto-Hellenic *-ehnos (inherited)

← Proto-Indo-European (derived)

← Proto-Indo-European *-os (mention)

← Proto-Indo-European *-nós (mention)

→ Ancient Greek σκοτεινός (affix)

→ Ancient Greek φωτεινός (affix)

→ Ancient Greek ἐρατεινός (affix)