The Collaborative International Dictionary of English v.0.48:

Flor'eal \Flo`r['e]al"\, n. [F. flor['e]al, fr. L. flos, floris,
   flower.]
   The eight month of the French republican calendar. It began
   April 20, and ended May 19. See Vend['e]miare.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Floreal
    n 1: eighth month of the Revolutionary calendar (April and May);
         the month of flowers