planula

noun
plan·u·la | \ ˈplan-yə-lə \
plural planulae\ˈplan-yə-ˌlē, -ˌlī \

Definition of planula 

: the very young usually flattened oval or oblong free-swimming ciliated larva of a coelenterate

First Known Use of planula

1835, in the meaning defined above

History and Etymology for planula

New Latin, from Latin planus level, flat — more at floor

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The first known use of planula was in 1835

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