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siphonoplax

noun
si·​phono·​plax | \sīˈfänəˌplaks, ˈsīfənōˌp-\
plural -es

Definition of siphonoplax 

: one of the calcareous plates that protect the siphon of various boring mollusks

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History and Etymology for siphonoplax

New Latin, from siphon- + Greek plax flat surface, tablet

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