The Collaborative International Dictionary of English v.0.48:

Gynocracy \Gy*noc"ra*cy\ (j[i^]*n[o^]k"r[.a]*s[y^]), n. [See
   Gynecocracy.]
   Female government; gynecocracy.
   [1913 Webster]

         The aforesaid state has repeatedly changed from
         absolute despotism to republicanism, not forgetting the
         intermediate stages of oligarchy, limited monarchy, and
         even gynocracy; for I myself remember Alsatia governed
         for nearly nine months by an old fishwoman. --Sir W.
                                                  Scott.
   [1913 Webster]