thermidor

from WordNet (r) 3.0 (2006)

Thermidor
    n 1: eleventh month of the Revolutionary calendar (July and
         August); the month of heat

from The Collaborative International Dictionary of English v.0.48

Thermidor \Ther`mi`dor"\, n. [F., fr. Gr. ? warm, hot.]
   The eleventh month of the French republican calendar, --
   commencing July 19, and ending August 17. See the Note under
   {Vend['e]miaire}.
   [1913 Webster]