noun
a structure in the form of a mass of nerve tissue, especially one located outside the brain or spinal cord
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The ganglion is a collection of nerve cell bodies outside the central nervous system.
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I heard that ganglion is some kind of nerve cluster outside the brain.
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My ganglion is acting up again, giving me all sorts of pains.
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The team leader serves as the ganglion of the group, connecting everyone together.