The Collaborative International Dictionary of English v.0.48:

Perdix \Per"dix\ (p[~e]r"d[i^]ks), prop. n. [L., a partridge,
   Gr. pe`rdix.] (Zool.)
   A genus of birds including the common European partridge.
   Formerly the word was used in a much wider sense to include
   many allied genera.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Perdix
    n 1: a genus of Perdicinae [syn: Perdix, genus Perdix]