The story
PIE word *dwóh₁ Etymology tree Proto-Indo-European *dwóh₁ Proto-Indo-European *dwi- Proto-Italic *dwi- Latin bi-bor. English bi- Proto-Indo-European *kʷelh₁- Proto-Indo-European *-eti Proto-Indo-European *kʷélh₁eti Proto-Italic *kʷelō Latin colō Proto-Indo-European *-tew-? Proto-Indo-European *-r-eh₂? Latin -tūra Latin cultūrader. Middle French cultureder. English culture Proto-Indo-European *h₂el- Proto-Indo-European *-is Proto-Indo-European *h₂élisder.? Proto-Italic *-ālis Latin -ālislbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English bicultural The adjective is derived from bi- (prefix meaning ‘two’) + culture + -al. The noun is derived from the adjective.
Etymology from Wiktionary, CC BY-SA 4.0.