Definitions
1.nounAn encapsulated collection of nerve-cell bodies, located outside the brain and spinal cord.
2.nounAny of certain masses of gray matter in the brain, as the basal ganglia.
3.noun(by extension) A centre of intellectual or industrial force, activity, etc.
4.nounA cystic tumour on a tendon sheath or joint capsule; a ganglion cyst.