Ganglion

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Ganglion

(n.) A mass or knot of nervous matter, including nerve cells, usually forming an enlargement in the course of a nerve.
(n.) A node, or gland in the lymphatic system; as, a lymphatic ganglion.
(n.) 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.