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  1. Oxford Dictionary

    annulus

    • IPA[ˈanjʊləs]

    英式

    • n.
      a ring-shaped object, structure, or region.；a plane figure consisting of the area between a pair of concentric circles.

    • noun: annulus, plural noun: annuli

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    annulus

    • IPA[ˈanyələs]

    美式

    • n.
      a ring-shaped object, structure, or region.

    Oxford American Dictionary