labret

noun

An ornament inserted into a perforation in the lip.

A piece of stone, bone, shell, or other material, inserted into the lip or into the cheek near the mouth, which is pierced for the purpose: an ornament or conventional symbol.

A piece of wood, shell, stone, or other substance, worn in a perforation of the lip or cheek.

A form of body piercing in which an object is attached to the lip.