Source : Webster's Revised Unabridged Dictionary (1913)

Canaliculus \Can`a*lic"u*lus\, n.; pl. {Canaliculi}. [L.]
   (Anat.)
   A minute canal.

Source : WordNet®

canaliculus
     n : a small canal or duct as in some bones and parts of plants
     [also: {canaliculi} (pl)]