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Occitan, especially as spoken and written in medieval times.
[French, from Old French : langue, language; see language + de, of (from Latin dē; see de-) + Old Provençal oc, yes; see Occitan.]
langue d'oc(lɑ̃ɡ dɔk)
(Languages) the group of medieval French dialects spoken in S France: often regarded as including Provençal. Compare langue d'oïl
[literally: language of oc (the Provençal form for yes), ultimately from Latin hoc this]
a former province in S France. Cap.: Toulouse.
Langue•do•cian (læŋˈdoʊ ʃən, ˌlæŋ gwəˈdoʊ-) adj., n.
langue d'oc(lɑ̃g ˈdɔk)
the Romance speech of medieval S France; medieval Occitan.
[1700–10; < French: language of oc, i.e., speech in which oc (< Latin hōc this) is used for “yes”; compare Occitan]