The Collaborative International Dictionary of English v.0.48:

Patriarchic \Pa`tri*ar"chic\ (p[=a]'tr[i^]*[aum]r"k[i^]k), a.
   [L. patriarchicus, Gr. patriarchiko`s.]
   Patriarchal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

patriarchic
    adj 1: (of societies) being ruled by or having descent traced
           through the male line