The girdle of an alb.
A ridge that girdles the base of an upper molar tooth.
The clitellus of earthworms.
A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells.
A collection of white matter fibers projecting from the cingulate gyrus to the entorhinal cortex in the brain, allowing for communication between components of the limbic system.
A helix.
A section of track that forms a circle and crosses over itself, used for gaining height in mountainous territory.
A self-sustaining process with a lot of momentum involved, so it is difficult to accelerate or stop it at once.
A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point.
Helical, like a spiral.
To increase continually.
To cause something to spiral.
To move along the path of a spiral or helix.