The Collaborative International Dictionary of English v.0.48:

Canaliculate \Can`a*lic"u*late\, Canaliculated
\Can`a*lic"u*la`ted\, a. [L. canaliculatus channeled, fr.
   canaliculus, dim. of canalis. See Canal.]
   Having a channel or groove, as in the leafstalks of most
   palms.
   [1913 Webster]

WordNet (r) 3.0 (2006):

canaliculate
    adj 1: having thin parallel channels; "canaliculate leafstalks
           of certain plants"