| invaginate planula | Embryonic stage of an animal when gastrulation occurs, follows blastula stage. (18 Nov 1997) |
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| planula | Origin: L, a little plane. 1. <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. Sometimes used as synonymous with gastrula. 2. <zoology> 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) |
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| invaginate | To ensheathe, infold, or insert a structure within itself or another. Origin: L. In, in, + vagina, a sheath (05 Mar 2000) |
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