The Collaborative International Dictionary of English v.0.48:

Palmatisect \Pal*mat"i*sect\, Palmatisected \Pal*mat`i*sect"ed\,
   a. [L. palmatus palmate + secare to cut.] (Bot.)
   Divided, as a palmate leaf, down to the midrib, so that the
   parenchyma is interrupted.
   [1913 Webster]