PluviosePronunciation: /ˈpluːvɪəʊs/ (also Pluviôse /plyvjoz/)Definition of Pluviose noun the fifth month of the French Republican calendar (1793–1805), originally running from 20 January to 18 February. Origin:French Pluviôse, from Latin pluviosus 'relating to rain'Pluviose in other Oxford dictionaries Definition of Pluviose in the US English dictionary