noun, plural planulae [plan-yuh-lee] . Zoology.
the ciliate, free-swimming larva of a coelenterate.

1865–70; < Neo-Latin, diminutive of Latin plānum something flat. See plane1, -ule

planular, planulate [plan-yuh-leyt] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
planula (ˈplænjʊlə)
n , pl -lae
the ciliated free-swimming larva of hydrozoan coelenterates such as the hydra
[C19: from New Latin: a little plane, from Latin plānum level ground]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
planula   (plān'yə-lə)  Pronunciation Key 
Plural planulae (plān'yə-lē')
The flat, free-swimming, ciliated larva of a cnidarian.
The American Heritage® Science Dictionary
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