"language of medieval France south of the Loire," 1664, from Fr. langue d'oc "speech of the south of France," lit. "the language of 'yes,' " from oc the word used for "yes" in southern France, from L. hoc "this;" as opposed to langue d'oïl, from the way of saying "yes" in the north of France (Mod.Fr. oui); each from a different word in L. phrase hoc ille (fecit) "this he (did)." The langue d'oïl has developed into standard Modern French.