annuli
Concentric circle regions
Annuli is the plural of annulus, a ring-shaped structure or region.
In geometry, an annulus is the area between two concentric circles—a flat donut shape.
The term appears in biology for ring-like markings or structures: The tree's annuli revealed its age.
In anatomy, it describes ring-shaped tissues like the fibrous rings between spinal vertebrae.
Annual wood layers
- growth ringsAnnual layers in wood
- dendrochronologyDating via growth rings
- cambiumPlant growth tissue
- sapwoodTree's water-conducting layer
heartwood · seasonal growth · xylem · wood grain · plant anatomy · vascular tissue · dating
Rings with shared midpoint
- ring-shapedForming a closed loop
- toroidalDoughnut-form geometry
- piCircle's fundamental ratio
- circumferenceCircle's outer measurement
Ringed gas giant
- planetary ringsDisk-shaped debris orbiting planets
- protoplanetaryPreceding planetary formation
- Kuiper beltDistant ring of frozen objects
- cosmic dustMicroscopic particles pervading space
ring systems · galactic · circumstellar · asteroid belt · ecliptic · exoplanets · solar system
Discrete anatomical divisions
- annelidsRinged-body worm phylum
- segmentationDivision into sections
- leechesBlood-drinking segmented worms
- tubewormsSedentary marine annelids
Circular domed chamber
- rose windowsCircular ornate church glazing
- barrel vaultsSemicircular ceiling structures
- oculusRound architectural opening
- medallionsLarge decorative discs
tree rings
Annual wood layers
- growth ringsAnnual layers in wood
- dendrochronologyDating via growth rings
- cambiumPlant growth tissue
sapwood · heartwood · seasonal growth · xylem · wood grain · plant anatomy · vascular tissue · dating
concentric circles
Rings with shared midpoint
- ring-shapedForming a closed loop
- toroidalDoughnut-form geometry
- piCircle's fundamental ratio
Saturn
Ringed gas giant
- planetary ringsDisk-shaped debris orbiting planets
- protoplanetaryPreceding planetary formation
- Kuiper beltDistant ring of frozen objects
cosmic dust · ring systems · galactic · circumstellar · asteroid belt · ecliptic · exoplanets · solar system
body segments
Discrete anatomical divisions
- annelidsRinged-body worm phylum
- segmentationDivision into sections
- leechesBlood-drinking segmented worms
rotunda
Circular domed chamber
- rose windowsCircular ornate church glazing
- barrel vaultsSemicircular ceiling structures
- oculusRound architectural opening
- annual returnTwelve-month financial summary
- annual reviewPeriodic employee evaluation
- annual eventRecurring yearly occasion
- annual leaveYearly paid time off
- annual reportOrganization's periodic financial summary
- annual salaryCompensation per year
annual, biannual, semiannual, annular, annulus, annuities, annulate, annuluses