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Related to langue doïl: Langue d'oc
langue d'oïl(lɑ̃g dɔˈil, ˈdɔ i, ˈdɔɪl)
the Romance speech of medieval N France; medieval French.
[1695–1705; < French: language of oïl, i.e., speech in which oïl is used for “yes” (Old French o il this he (did) < Latin hōc ille; compare French oui)]