
1) Revolutionary calendar month
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https://www.crosswordclues.com/clue/nivose

For the frigate of the French Navy, see Nivôse (F 732) Nivôse (nivoz; also Nivose) was the fourth month in the French Republican Calendar. The month was named after the Latin word nivosus, which means snowy. Nivôse was the first month of the winter quarter (mois d`hiver). It started between 21 and 23 December. It ended between 19 and 21 Januar....
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http://en.wikipedia.org/wiki/Nivôse

• (n.) The fourth month of the French republican calendar [1792-1806]. It commenced December 21, and ended January 19. See VendEmiaire. • (n.) The fourth month of the French republican calendar [1792-1806]. It commenced December 21, and ended January 19. See VendEmiaire.
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http://thinkexist.com/dictionary/meaning/nivose/
Ni`vose' noun [ French, from Latin
nix .
nivis , snow.] The fourth month of the French republican calendar [ 1792-1806]. It commenced December 21, and ended January 19. See
VendÉmiaire .
Found on
http://www.encyclo.co.uk/webster/N/25

The Nivose is a French Floreal Class patrol frigate of 2600 tons displacement launched in 1991, and officially described as 'Fregates de Surveillance' and designed to operate in the offshore zone in low intensity operations. She is powered by SEMT-Pielstick 6PA 6L280 diesels rated at 8800 hp providing a top speed of 20 knots and a range of 14400 km...
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http://www.probertencyclopaedia.com/browse/RN.HTM

[
n] - fourth month of the Revolutionary calendar (December and January)
Found on
http://www.webdictionary.co.uk/definition.php?query=Nivose

Nivose 1. The fourth month of the French revolutionary calendar, extending (in 1793 to 1794) from 21 December to 19 January; literally, 'month of snow'; coined by Fabre d'Églantine in 1793. 2. The month was named after the Latin word nivosus, meaning 'snow, snowy'. According to Fabre d'Églantine: 'In Nivôse, earth is sealed and usually covered...
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http://www.wordinfo.info/words/index/info/view_unit/1400/
noun fourth month of the Revolutionary calendar (December and January); the snowy month
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https://www.encyclo.co.uk/local/20974

(in the French Revolutionary calendar) the fourth month of the year, extending from December 21 to January 19.
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https://www.infoplease.com/dictionary/nivose
No exact match found.