Definitions
1.nounA pattern of concentric circles.
2.nounA circle of three or more leaves, flowers, or other organs, about the same part or joint of a stem.
3.nounA volution, or turn, of the spire of a univalve shell.
4.nounAny volution, as for example in the human ear or fingerprint.
5.nounA flywheel, a weight attached to a spindle.