
1) Opera set in France 2) Revolutionary calendar month
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https://www.crosswordclues.com/clue/messidor

Messidor (mesidɔʁ) was the tenth month in the French Republican Calendar. The month was named after the Latin word messis, which means harvest. Messidor was the first month of the summer quarter (mois d`été). It started June 19 or June 20. It ended July 18 or July 19. It follows the Prairial and precedes the Thermidor. == Day name table == Li....
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http://en.wikipedia.org/wiki/Messidor
[opera] Messidor is a four-act operatic drame lyrique by Alfred Bruneau to a French libretto by Émile Zola. The opera premiered on February 19, 1897 in Paris. The opera title comes from the tenth month of the French Republican Calendar. Although initially successful, the popularity of Messidor was adversely affected by the Dreyfus Affair w...
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http://en.wikipedia.org/wiki/Messidor_(opera)

One of the months of the French revolutionary calendar, adopted in 1793 and intended to rationalize the inconsistent old system of months and seasons. Months (beginning at the autumnal equinox), included Vend¯miaire, Brumaire, Frimaire, Niv se, Pluvi se, Vent se, Germinal, Flor¯al, Prairial, Messidor, Thermidor, and Fructidor.
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http://soviethistory.msu.edu/glossary/

• (n.) The tenth month of the French republican calendar dating from September 22, 1792. It began June 19, and ended July 18. See VendEmiaire.
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http://thinkexist.com/dictionary/meaning/messidor/
Mes`si`dor' noun [ French, from Latin
messis harvest.] The tenth month of the French republican calendar dating from September 22, 1792. It began June 19, and ended July 18. See
VendÉmiaire .
Found on
http://www.encyclo.co.uk/webster/M/54

Messidor is a cultivated variety of potato.
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http://www.probertencyclopaedia.com/browse/QM.HTM

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