资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pinnatifid \Pin*nat"i*fid\, a. [L. pinnatus feathered + root of
   findere to split: cf. F. pinnatifide.] (Bot.)
   Divided in a pinnate manner, with the divisions not reaching
   to the midrib.

资料来源 : WordNet®

pinnatifid
     adj : of a leaf shape; cleft nearly to the midrib in broad
           divisions not separated into distinct leaflets