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Annulus
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  • Annulus (heart), the ring-like structure on a Heart Valve where the valve leaflets are anchored.

  • Annulus (spine), the outer wall of the invertebral disc.

  • Annulus (entomology), a ring-like surrounding a joint, segment, or other structure.

  • Annulus (ichthyology), the annual rings that form in fish scales or bone sections.

  • Annulus (mycology) , the "ring" on a Mushroom stem.

  • Annulus (astronomy), the ring of light from the visible part of the photosphere seen at the greatest extent of an Annular Eclipse .

  • Annulus (mathematics) , a ring-shaped geometric figure.

  • More generally, any ring shaped object, structure, or pattern.