A Cingulum

1. The girdle of an alb.
2. (neuroanatomy) 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.
3. (anatomy) A ridge that girdles the base of an upper molar tooth.
4. (zoology) A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells.
5. (zoology) The clitellus of earthworms.