Etymology
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ganglion (n.)

1680s, "tumor, swelling;" 1732 as "bundle of nerves," from Greek ganglion "tumor under the skin," used by Galen for "nerve bundle;" of unknown origin. According to Galen, the proper sense of the word was "anything gathered into a ball."

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Definitions of ganglion

ganglion (n.)
an encapsulated neural structure consisting of a collection of cell bodies or neurons;
From wordnet.princeton.edu