langue d'oil The dialect formerly spoken north of the Loire (in
which the word for "yes" was oil, F. oui).
Wikipedia
"Langues d'oïl" (which literally means in English: "languages of yes") is the linguistic and historical name for the Gallo-Romance languages which developed from Latin in the northern territories of Roman Gaul that now are occupied by northern France, part of Belgium and the Channel Islands.
Meanings and disambiguation.
"Langue d'oïl" (in the singular), "Oïl dialects" and "Oïl languages" (in the plural) refer to all the ancient northern Gallo-Romance languages as well as their modern-day descendants. The most widely spoken modern Oïl language is French, and others include Norman, Walloon, Picard, Gallo, Poitevin-Saintongeais, Champenois.
They share many common linguistic features. One of these is that "Oïl" (pronounced [wil], or [wi] as in modern French "oui"), was the ancestor of the word for "yes" used in all the Oïl languages ("oc" was and still is the word used in territories to the south, and that is why the Occitan language is also called "langue d'oc" (literal English translation: "language of yes")).
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