Definition of Planula

1. Noun. The flat ciliated free-swimming larva of hydrozoan coelenterates.

Generic synonyms: Hydroid, Hydrozoan



Definition of Planula

1. n. In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula.

Definition of Planula

1. Noun. (biology) In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. ¹

2. Noun. (zoology) The larva of a hydrozoan, which is free-swimming and covered in cilia. ¹

¹ Source: wiktionary.com

Definition of Planula

1. the free-swimming larva of certain organisms [n -LAE] : PLANULAR [adj]

Medical Definition of Planula

1. Origin: L, a little plane. 1. In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula. 2. The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia. Source: Websters Dictionary (01 Mar 1998)

Planula Pictures

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Lexicographical Neighbors of Planula

plantlet
plantlets
plantlife
plantlike
plantlike flagellate
plantocracies
plantocracy
plants
plantsman
plantsmen
plantule
plantules
plantwide
plantwise
plantæ
planula (current term)
planulae
planular
planulate
planuloid
planum
planum intertuberculare
planum occipitale
planum orbitale
planum popliteum
planum semilunatum
planum sphenoidale
planum sternale
planum subcostale

Literary usage of Planula

Below you will find example usage of this term as found in modern and/or classical literature:

1. Proceedings of the American Association for the Advancement of Science by American Association for the Advancement of Science (1883)
"The special point to which the author wished to call attention is the fact that the cilia are developed before the planula bursts forth from the ..."

2. Summarized Proceedings ... and a Directory of Members by American Association for the Advancement of Science (1883)
"The special point to which the author wished to call attention is the fact that the cilia are developed before the planula bursts forth from the ..."

3. Seaside Studies in Natural History by Elizabeth Cabot Cary Agassiz, Alexander Agassiz (1871)
"... many of the fixed Hydroids, is perhaps more striking when we compare the earlier stages of their growth. Suppose, for instance, that the planula of our ..."

4. Proceedings of the American Association for the Advancement of Science by American Association for the Advancement of Science (1883)
"The special point to which the author wished to call attention is the fact that the cilia are developed before the planula bursts forth from the ..."

5. Summarized Proceedings ... and a Directory of Members by American Association for the Advancement of Science (1883)
"The special point to which the author wished to call attention is the fact that the cilia are developed before the planula bursts forth from the ..."

6. Seaside Studies in Natural History by Elizabeth Cabot Cary Agassiz, Alexander Agassiz (1871)
"... many of the fixed Hydroids, is perhaps more striking when we compare the earlier stages of their growth. Suppose, for instance, that the planula of our ..."

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