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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