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  1. Oxford Dictionary

    umbilicus

    • IPA[ʌmˈbɪlɪkəs]

    英式

    • n.
      the navel.；a depression or hole at the centre of the shell whorls of some gastropod molluscs and many ammonites.

    • noun: umbilicus, plural noun: umbilici

    • 釋義

    名詞

    • 1. the navel.
    • 2. a depression or hole at the centre of the shell whorls of some gastropod molluscs and many ammonites.
    • ▪ a hole at each end of the hollow shaft of a feather.