
1) Like a grassland 2) Revolutionary calendar month
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https://www.crosswordclues.com/clue/prairial

Prairial (pʁɛʁjal) was the ninth month in the French Republican Calendar. This month was named after the French word prairie, which means meadow. It was the name given to several ships. Prairial was the third month of the spring quarter (mois de printemps). It started May 20 or May 21. It ended June 18 or June 19. It follows the Floréal and pr...
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http://en.wikipedia.org/wiki/Prairial
[ship] The following ships are named Prairial: ...
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http://en.wikipedia.org/wiki/Prairial_(ship)
[supertanker] Prairial was a supertanker, built in 1979 by Chantiers de l`Atlantique at Saint-Nazaire for Compagnie Nationale de Navigation. Prairial, which was the fourth and final vessel of Batillus class supertankers (the other three were Batillus, Bellamya and Pierre Guillaumat). She was the only ship of that class to have a career long...
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http://en.wikipedia.org/wiki/Prairial_(supertanker)

• (n.) The ninth month of the French Republican calendar, which dated from September 22, 1792. It began May, 20, and ended June 18. See Vendemiaire.
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http://thinkexist.com/dictionary/meaning/prairial/
Prai`ri`al' noun [ French, from
prairie meadow.] The ninth month of the French Republican calendar, which dated from September 22, 1792. It began May, 20, and ended June 18. See
Vendemiaire .
Found on
http://www.encyclo.co.uk/webster/P/141

The Prairial 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 ...
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http://www.probertencyclopaedia.com/browse/RP.HTM

[
n] - ninth month of the Revolutionary calendar (May and June)
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http://www.webdictionary.co.uk/definition.php?query=Prairial
noun ninth month of the Revolutionary calendar (May and June); the month of meadows
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https://www.encyclo.co.uk/local/20974
No exact match found.