Etymology
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basal (adj.)

"relating to or situated at a base," 1826, from base (n.) + -al (1).

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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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ganglia (n.)
Latin plural of ganglion. Related: Gangliac, ganglial, gangliar, ganglious. The larger ones are plexuses (see plexus).
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