trochophore

noun
trocho·phore | \ˈträ-kə-ˌfȯr \

Definition of trochophore 

: a free-swimming ciliate larva occurring in several invertebrate groups (such as the polychaete worms and mollusks)

First Known Use of trochophore

1892, in the meaning defined above

History and Etymology for trochophore

ultimately from Greek trochos wheel + pherein to carry — more at bear

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The first known use of trochophore was in 1892

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