Annulus

Annulus, being the Latin for 'ring' is a term used to describe various ring-shaped objects:

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), an antennal unit in simple antennae, or a ring-like marking or structure surrounding a joint or segment.
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.
Annulus (oil well), the tube shaped void between the drill string and the formation when drilling an oil well.
More generally, any ring shaped object, structure, or pattern.

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