The Collaborative International Dictionary of English v.0.48:

caballine \cab"al*line\ (k[a^]b"al*l[imac]n), a. [L.caballinus,
   fr. caballus a nag. Cf. Cavalier.]
   Of or pertaining to a horse. -- n. Caballine aloes.
   [1913 Webster]

   caballine aloes, an inferior and impure kind of aloes
      formerly used in veterinary practice; -- called also
      horse aloes.

   Caballine spring, the fountain of Hippocrene, on Mount
      Helicon; -- fabled to have been formed by a stroke from
      the foot of the winged horse Pegasus.
      [1913 Webster]