Old French boul

← Catalan bedoll (cognate)

← Gaulish *betua (derived)

← Proto-Celtic *betwiyos (derived)

← Proto-Celtic *betuyā (mention)

← Proto-Indo-European *gʷet- (derived)

← Italian betulla (cognate)

← Latin *betūle (mention)

← Latin *betūlus (mention)

← Latin betulla (inherited)

← Portuguese bétula (cognate)

→ English bull (cognate)

→ French bouleau (inherited)

→ Gallo boula (derived)