Definition of planula
planulae
play \ˈplan-yə-ˌlē, -ˌlī\: the very young usually flattened oval or oblong free-swimming ciliated larva of a coelenterate
From the M-W Editors
Origin and Etymology of planula
New Latin, from Latin planus level, flat — more at floor
First Known Use: 1835
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Britannica.com: Encyclopedia article about planula
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