Gān'gli-on, n.

(gāng'gli-on), n. [Lat. ganglion, Gr. γάγγλιον, a sort of swelling or excrescence, a tumor under the skin.]

1. (Compar. Anat.) (a.) A collection of nerve cells from which nerve fibers are given off in one or more directions;—held to be the productive organ of action; as, the hemispherical ganglion; the optic ganglion. (b.) (Human Anat.) A small mass of vesicular neurine in the course of a nerve, distinct from the brain and spinal cord; as, the Gesserian ganglion; also, a lymphatic gland.
2. (Surg.) A globular, hard, indolent tumor, always situated somewhere on a tendon, formed by the elevation of the sheath of the tendon, and the effusion of a viscid fluid into it.

Lymphatic ganglion, a lymphatic gland. Dunglison.