gan·gli·on (g ng gl - n)n. pl. gan·gli·a (-gl -) or gan·gli·ons 1. Anatomy A group of nerve cells forming a nerve center, especially one located outside the brain or spinal cord. 2. A center of power, activity, or energy. 3. Pathology A benign cystic lesion resembling a tumor, occurring in a tendon sheath or joint capsule. [From Greek, cystlike tumor, nerve bundle.] gan  gli·onic (- n k) adj. |
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