NivosePronunciation: /nɪˈvəʊz/ (also Nivôse /nivoz/)Definition of Nivose noun the fourth month of the French Republican calendar (1793–1805), originally running from 21 December to 19 January. Origin:French Nivôse, from Latin nivosus 'snowy', from nix, niv- 'snow'Nivose in other Oxford dictionaries Definition of Nivose in the US English dictionary