frimaire

from WordNet (r) 3.0 (2006)

Frimaire
    n 1: third month of the Revolutionary calendar (November and
         December); the frosty month

from The Collaborative International Dictionary of English v.0.48

Frimaire \Fri"maire`\, n. [F., fr. frimas hoarfrost.]
   The third month of the French republican calendar. It
   commenced November 21, and ended December 20., See
   {Vend['e]miaire}.
   [1913 Webster]