The Collaborative International Dictionary of English v.0.48:

Fisc \Fisc\ (f[i^]sk), n. [F. fisc, fr. L. fiscus basket, money
   basket, treasury; prob. akin to fascis bundle. See Fasces.]
   A public or state treasury. --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fisc
    n 1: a state treasury or exchequer or a royal treasury;
         originally the public treasury of Rome or the emperor's
         private purse