'Cingulum' definitions:

Definition of 'cingulum'

(from WordNet)
noun
(anatomy) an encircling structure (as the ridge around the base of a tooth)

Definition of 'Cingulum'

From: GCIDE
  • Cingulum \Cin"gu*lum\, n. [L., a girdle.] (Zool.) (a) A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells. (b) The clitellus of earthworms. (c) The base of the crown of a tooth. [1913 Webster]