ganglion

n.; pl. L. Ganglia E. Ganglions [ L. ganglion a sort of swelling or excrescence, a tumor under the skin, Gr. &unr_;: 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 ]