Source : Webster's Revised Unabridged Dictionary (1913)

Bipinnatifid \Bi`pin*nat"i*fid\, a. [Pref. bi- + pinnatifid.]
   (Bot.)
   Doubly pinnatifid.

   Note: A bipinnatifid leaf is a pinnatifid leaf having its
         segments or divisions also pinnatifid. The primary
         divisions are pinn[ae] and the secondary pinnules.

Source : WordNet®

bipinnatifid
     adj : pinnatifid with the segments also pinnatifid