The Collaborative International Dictionary of English v.0.48:

Girondist \Gi*ron"dist\, n. [F. Girondiste.]
   A member of the moderate republican party formed in the
   French legislative assembly in 1791. The Girondists were so
   called because their leaders were deputies from the
   department of La Gironde.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Girondist \Gi*ron"dist\, a.
   Of or pertaining to the Girondists. [Written also
   Girondin.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

Girondist
    n 1: a member of the moderate republican party that was in power
         during the French Revolution; the Girondists were
         overthrown by their more radical rivals the Jacobins [syn:
         Girondist, Girondin]