whorl

noun

1. a round shape formed by a series of concentric circles (as formed by leaves or flower petals)

   noun.shape

   Synonyms coil curl curlicue gyre ringlet roll scroll

   Source: WordNet 3.0

2. a strand or cluster of hair

   noun.body

   Synonyms curl lock ringlet

   Source: WordNet 3.0

3. a structure consisting of something wound in a continuous series of loops

   noun.artifact

   Synonyms coil helix spiral volute

   Source: WordNet 3.0

4. A circle of two or more leaves, flowers, or other organs, about the same part or joint of a stem.

   noun

   Source: webster1913