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protoconch

noun
pro·​to·​conch | \ ˈprōtə+ˌ-\

Definition of protoconch

1 : the embryonic shell of a mollusk (as a univalve)
2 : the apical chamber or whorl of an ammonite or gastropod

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Other Words from protoconch

protoconchal \ ¦⸗⸗+ \ adjective

History and Etymology for protoconch

International Scientific Vocabulary prot- + conch

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