Ring of cartilage in the shoulder

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
lip or lip-like part, 1816, in various anatomical and zoological uses, from Latin labrum , cognate with labium "lip" (see lip (n.)). Also noted mid-15c. as the name of some herb.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Labrum \La"brum\, n.; pl. L. Labra , E. Labrums . [L.] A lip or edge, as of a basin. (Zo["o]l.) An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip. See Illust. of Hymenoptera . The external margin of the ...

Wikipedia Word definitions in Wikipedia
Labrum Latin, defined as "having the edge" Labrum London (fashion) , Menswear fashion brand Labrum (arthropod mouthpart) Labrum (architecture) , a large water-filled vessel or basin with an overhanging lip Labrum (surname) , an English surname Acetabular ...

Wiktionary Word definitions in Wiktionary
n. 1 The uppermost of the mouthparts (trophi) of a typical insect, such as a cockroach. Typically resembles an upper lip and forms part of the roof of the mouth in such insects. 2 (context anatomy English) Any of several lip-like projections. 3 A large ...