Source : Webster's Revised Unabridged Dictionary (1913)

Tripinnatifid \Tri`pin*nat"i*fid\, a. [Pref. tri- + pinnatifid.]
   (Bot.)
   Thrice pinnately cleft; -- said of a pinnatifid leaf when its
   segments are pinnatifid, and the subdivisions of these also
   are pinnatifid.

Source : WordNet®

tripinnatifid
     adj : of a leaf shape: bipinnatifid with segments pinnatifid