Definition of black-lip in US English:

black-lip

adjective

  • Designating molluscs (and their shells) having a black lip to the shell, especially the pearl oyster, Pinctada margaritifera. Also: designating molluscs having a black edge to the foot, especially an Australian abalone, Haliotis rubra. Usually attributive.

Origin

Mid 19th century. From black + lip.

Pronunciation

black-lip

/ˈblaklɪp/