Ganglion \Gan"gli*on\, n.; pl. L. Ganglia, E. Ganglions.
         [L.
   ganglion a sort of swelling or excrescence, a tumor
         under the
   skin, Gr. ?: cf. F. ganglion.]
   1.
         (Anat.)
      (a) A mass or knot of nervous matter,
         including nerve
          cells, usually forming an enlargement in the course of
          a nerve.
      (b) A node, or gland in the lymphatic
         system; as, a
          lymphatic ganglion.
          [1913 Webster]

   2. (Med.) A globular, hard, indolent
         tumor, situated
      somewhere on a tendon, and commonly
         formed by the effusion
      of a viscid fluid into it; --
         called also weeping
         sinew.
      [1913 Webster]

  
         Ganglion cell, a
         nerve cell. See Illust. under
         Bipolar.
      [1913
         Webster]