Annulus
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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 (entomology) - an antennal unit in simple antennae, or a ring-like marking or structure surrounding a joint or segment
- Annulus fibrosus - the outer wall of the invertebral disc
- 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 (stargate) - the K'tau word for the Stargate.
- 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.
