planula
noun
plan·u·la ˈplan-yə-lə 
plural planulae ˈplan-yə-ˌlē
-ˌlī
: the very young usually flattened oval or oblong free-swimming ciliated larva of a cnidarian
Word History
Etymology
New Latin, from Latin planus level, flat — more at floor
First Known Use
1835, in the meaning defined above
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