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plan·u·la | \ ˈplan-yə-lə 
\
\ plural planulae\ ˈplan-yə-ˌlē , -ˌlī \
, -ˌlī \Definition of planula
: the very young usually flattened oval or oblong free-swimming ciliated larva of a cnidarian
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Time Traveler for planula
The first known use of planula was in 1835
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