coil, whorl, roll, curl, curlicue, ringlet, gyre, scroll (noun)

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

lock, curl, ringlet, whorl (noun)

a strand or cluster of hair

coil, spiral, volute, whorl, helix (noun)

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

"a coil of rope"

whorl (Noun)

A pattern of concentric circles.

whorl (Noun)

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

whorl (Noun)

A volution, or turn, of the spire of a univalve shell.

whorl (Noun)

A flywheel, a weight attached to a spindle, compare 1460.

whorl (Verb)

To form a pattern of concentric circles.

whorl (Noun)

Plural form of whorl foot.

Whorl

A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites. A spiral shell can be visualized as consisting of a long conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in work of D’Arcy Wentworth Thompson and David Raup. The main factor is how rapidly the conical tube expands over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorls. When the mathematical factors governing the pattern of growth are such that there is a very rapid expansion of the conical shape, of the shell tube, then the adult shell has very few whorls. The number of whorls present in an adult shell differs greatly in various taxa. The extant marine gastropod families Turritellidae and Terebridae, and the extinct Mesozoic family Nerineidae, have very high spired shells with a large number of whorls, and a relatively small aperture.

Whorl

A whorl ( or ) 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).