Definition of protoconch in English:

protoconch

noun

Zoology
  • The embryonic shell in gastropods and certain cephalopods, often retained at the tip of the adult shell.

Origin

Late 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist. From proto- + conch.

Pronunciation

protoconch

/ˈprəʊtə(ʊ)ˌkɒŋk/