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prototroch

noun pro·to·troch \ ˈprōtə‧ˌträk \
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Definition of prototroch

plural -s
: the ciliated band or ring characteristic of trochophore larvae
—

prototrochal

\prōtä‧trəkəl\ adjective

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Origin and Etymology of prototroch

prot- + -troch

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