Source : Webster's Revised Unabridged Dictionary (1913)

Serpentize \Ser"pent*ize\, v. i.
   To turn or bend like a serpent, first in one direction and
   then in the opposite; to meander; to wind; to serpentine.
   [R.]

         The river runs before the door, and serpentizes more
         than you can conceive.                   --Walpole.