'Prairial' definitions:

Definition of 'Prairial'

(from WordNet)
noun
Ninth month of the Revolutionary calendar (May and June); the month of meadows

Definition of 'Prairial'

From: GCIDE
  • Prairial \Prai`ri`al"\, n. [F., fr. 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. [1913 Webster]