Whorl

For other uses, see Whorl (disambiguation).

Main whorled patterns.

A whorl (/wɜːrl/ or /wɔːrl/) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).

In nature

For further examples, see Spiral and Concentric objects.

• 
  Botanical whorls: sepals, petals, leaves, or branches radiating from a single point (photo of flower of Friesodielsia desmoides, family Annonaceae, juxtaposed with diagram of axial cross-section)
• 
  Mollusc whorls: Each complete 360° turn in the spiral growth of the shell of the mollusc Anisus septemgyratus, family Planorbidae.
• 
  A hair whorl is a patch of hair growing in a circular direction around a visible center point.
• 
  In a fingerprint, a whorl is each ridge arranged circularly around a central point on the finger.
• 
  In histopathologic architecture, a whorled pattern consists of multiple concentric objects, or a spiral-shaped pattern. Bone tissue is shown.

For mollusc whorls, the body whorl in a mollusc shell is the most recently formed whorl of a spiral shell, terminating in the aperture.

Artificial objects

• 
  A spindle whorl is a disc or spherical object fitted onto the spindle to increase and maintain the speed of the spin.

See also

• Whirl (disambiguation)

External links

• The dictionary definition of whorl at Wiktionary