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From The Collaborative International Dictionary of English v.0.48:
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]