A tool for drawing accurate circles or arches, usually consisting of two arms joined at one end in such a way that the arms can be opened and closed; one of the arms is pointed at its free end while the other holds a pencil, pencil lead or some other implement for making marks.
Each circle, volution or equivalent in a pattern of concentric circles, ovals, arcs, or a spiral.
A circle of three or more leaves, flowers, or other organs, about the same part or joint of a stem.
A flywheel, a weight attached to a spindle.
A volution, or turn, of the spire of a univalve shell.
Any volution, as for example in the human ear or fingerprint.
To form a pattern of concentric circles.