Definition of pearl shell in US English:

pearl shell

noun

  • A shell which is lined with nacre or mother-of-pearl; the substance of such shells, as a material or commodity.

Origin

Early 17th century; earliest use found in Joshua Sylvester (d. 1618), poet and translator. From pearl + shell.

Pronunciation

pearl shell

/ˈpəːl ʃɛl/