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protoconch

noun pro·to·conch \ ˈprōtə+ˌ- \
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Definition of protoconch

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

protoconchal

adjective

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Origin and Etymology of protoconch

International Scientific Vocabulary prot- + conch

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