cingulum vs sheath

cingulum

noun
  • The clitellus of earthworms. 

  • A ridge that girdles the base of an upper molar tooth. 

  • The girdle of an alb. 

  • 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. 

sheath

noun
  • One of the elytra of an insect. 

  • The base of a leaf when sheathing or investing a branch or stem, as in grasses. 

  • A holster for a sword; a scabbard. 

  • A condom. 

  • The foreskin of certain animals (for example, dogs and horses). 

  • A tight-fitting dress. 

  • Anything that has a similar shape to a scabbard that is used to hold an object that is longer than it is wide. 

  • The insulating outer cover of an electrical cable. 

How often have the words cingulum and sheath occurred in a corpus of books? (source: Google Ngram Viewer )