noun
whorl
WURL/wɜːrl/
A spiral pattern or ringlike arrangement.
The snail's shell forms an expanding spiral whorl.

Etymology
Whirl named the small rotating flywheel of a spindle. Whorl extended this circular image to arrangements around a plant stem and to the coils of shells and other spiral structures.
In context
the whorl, found in 30-35% of all observed fingerprint impressions. Observe this impression closely. This pattern looks like a spiral and has a few ridges which complete a circle.
More examples
- His hair grows in a whorl at the crown.
- The leaves form a whorl around the stem.
- She pipes whorls of frosting onto the cupcakes.
Forms
whorl · whorls
whorled adjective — Arranged in spirals or circular rings.