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[plan-yuh-luh] /ˈplæn yə lə/
noun, plural planulae
[plan-yuh-lee] /ˈplæn yəˌli/ (Show IPA).
the ciliate, free-swimming larva of a coelenterate.
1865-70; < New Latin, diminutive of Latin plānum something flat. See plane1, -ule
Related forms
planular, planulate
[plan-yuh-leyt] /ˈplæn yəˌleɪt/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for planular


noun (pl) -lae (-ˌliː)
the ciliated free-swimming larva of hydrozoan coelenterates such as the hydra
Derived Forms
planular, adjective
Word Origin
C19: from New Latin: a little plane, from Latin plānum level ground
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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planular in Science
Plural planulae (plān'yə-lē')
The flat, free-swimming, ciliated larva of a cnidarian.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for planular


free-swimming or crawling larval type common in many species of the phylum Cnidaria (e.g., jellyfish, corals, and sea anemones). The planula body is more or less cylindrical or egg-shaped and bears numerous cilia (tiny hairlike projections), which are used for locomotion. Planulae are produced by both of the basic body forms found in cnidarians-polyps, the stalklike, attached adult forms, and medusae, the bell- or umbrella-shaped, free-swimming adult forms. See also polyp (zoology); medusa.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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