The Collaborative International Dictionary of English v.0.48:

Tarsal \Tar"sal\, a. (Anat.)
   Of or pertaining to the tarsus (either of the foot or eye).
   -- n. A tarsal bone or cartilage; a tarsale.
   [1913 Webster]

   Tarsal tetter (Med.), an eruptive disease of the edges of
      the eyelids; a kind of bleareye.
      [1913 Webster]