gastrula
(noun) double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
Source: WordNet® 3.1
gastrula (plural gastrulas or gastrulae)
(embryology) A stage in the development of embryos of most animals consisting of a three-layered sac of ectoderm, mesoderm and endoderm.
• stragula
Source: Wiktionary
Gas"tru*la, n.; pl. Gastrulæ Etym: [NL., dim. fr. Gr. (Biol.)
Definition: An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastræa.
– a.
Definition: Of or pertaining to a gastrula.
Source: Webster’s Unabridged Dictionary 1913 Edition
10 May 2025
(verb) declare (a dead person) to be blessed; the first step of achieving sainthood; “On Sunday, the martyr will be beatified by the Vatican”
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