GNU Collaborative International Dictionary of English

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1.       
   Ganglion , n.; pl. L. Ganglia , E. Ganglions . [L. ganglion a sort of swelling or excrescence, a tumor under the skin, Gr. : cf. F. ganglion.]
   (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
   (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