n. (pl. ganglia or ganglions) 1 a an enlargement or knot on a nerve etc. containing an assemblage of nerve-cells. b a mass of grey matter in the central nervous system forming a nerve-nucleus. 2 Med. a cyst, esp. on a tendon sheath. 3 a centre of activity or interest. gangliar adj. gangliform adj. ganglionated adj. ganglionic adj.
[ Gk gagglion ]