A variant or archaic spelling of ganglion, a group of nerve cells forming a nerve cluster.
From Greek 'ganglion' meaning 'tumor' or 'swelling,' used metaphorically to describe the swollen appearance of nerve clusters. This particular spelling with 'o' represents an older English variant.
Ganglion cysts on your wrist or ankle are harmless 'ganglia' (plural of ganglion) that doctors sometimes call 'Bible cysts' because patients would hit them with a heavy book to try to flatten them.
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