The Collaborative International Dictionary of English v.0.48:

Croat \Cro"at\ (kr?"?t), n. [Cf. Cravat.]
   1. A native or resident of Croatia.
      [1913 Webster]

   2. An irregular soldier, generally from Croatia. [archaic]
      [1913 Webster]

WordNet (r) 3.0 (2006):

Croat
    n 1: a member of the Slavic people living in Croatia [syn:
         Croatian, Croat]