{{lb|en|topology|in combination|n-torus|4-torus|etc.}} The product of the specified number of circles.
The thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity.
A rounded ridge of bone or muscle, especially one on the occipital bone.
A topological space which is a product of two circles.
A large convex molding, typically semicircular in cross section, which commonly projects at the base of a column and above the plinth.
The end of the peduncle or flower stalk to which the floral parts (or in the Asteraceae, the florets of a flower head) are attached.
A ring-shaped object, especially a large ring-shaped chamber used in physical research.
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.