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  1. Oxford American Dictionary

    suprachiasmatic nucleus

    • IPA[ˌso͞oprəˌkīəzˌmadik ˈno͞oklēəs]

    美式

    • n.
      each of a pair of small nuclei in the hypothalamus of the brain, above the optic chiasma, thought to be concerned with the regulation of physiological circadian rhythms.

    • noun: suprachiasmatic nucleus, plural noun: suprachiasmatic nuclei