protoconch

noun

pro·​to·​conch

ˈprōtə+ˌ-

1

: the embryonic shell of a mollusk (as a univalve)

2

: the apical chamber or whorl of an ammonite or gastropod

protoconchal

¦⸗⸗+

adjective

Word History

Etymology

International Scientific Vocabulary prot- + conch

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