1. (zoology) a plate-like structure forming the upper lip in many arthropods
   "The labrum of the beetle helps guide food into its mouth"
    
2. (anatomy) the ring of cartilage surrounding the socket of the hip joint or shoulder joint
   "The athlete suffered a torn labrum in his shoulder"
    
3. The outer edge or lip of the aperture of a mollusk shell
   "The labrum of this conch shell was damaged, affecting its value to collectors"

Derived forms: labra

Encyclopedia: Labrum