Gastrula Gas"tru*la, n.; pl. {Gastrul[ae]}[NL., dim. fr. Gr. ? the stomach.] (Biol.) 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 {Gastr[ae]a}. -- a. Of or pertaining to a gastrula. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • gastrulae — n. stage in embryonic development (Biology) …   English contemporary dictionary

  • gastrula — noun (plural las or gastrulae) Etymology: New Latin, from gastr Date: 1876 an early metazoan embryo in which the ectoderm, mesoderm, and endoderm are established either by invagination of the blastula (as in fish and amphibians) to form a… …   New Collegiate Dictionary

  • Gasträa — Gasträa, eine hypothetische Tierform, welche die Ahnenform der meisten Tiere, nämlich aller Metazoen (s.d.), darstellen soll. Sie bestand angeblich aus einem Sack mit doppelter Wandung; die äußere Wand bildete die Haut, die innere umschloß die… …   Meyers Großes Konversations-Lexikon

  • gastrula — gastrular, adj. /gas troo leuh/, n., pl. gastrulas, gastrulae / lee /. Embryol. a metazoan embryo in an early state of germ layer formation following the blastula stage, consisting of a cuplike body of two layers of cells, the ectoderm and… …   Universalium

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  • gastrula — [ gastrʊlə] noun (plural gastrulae li:) Embryology an embryo at the stage following the blastula, when it is a hollow cup shaped structure having three layers of cells. Derivatives gastrulation noun Origin C19: mod. L., from Gk gastēr, gastr… …   English new terms dictionary

  • emboly — /ˈɛmbəli/ (say embuhlee) noun a gradual embedding of one part into another, as in the formation of certain gastrulae. {Greek embolē throwing in, invasion} …   Australian English dictionary

  • gastrula — /ˈgæstrələ/ (say gastruhluh) noun (plural gastrulae /ˈgæstrəli/ (say gastruhlee)) the developing embryo when it consists of the three germ layers, occupying their characteristic positions. {New Latin, diminutive of Greek gastēr belly, stomach}… …   Australian English dictionary

  • gastrula — [gas′tro͞o lə] n. pl. gastrulae [gas′tro͞olē΄, gas′tro͞olī] or gastrulas [ModL, dim. < Gr gastēr, the stomach] an embryo in an early stage of development, consisting of a sac with two layers, the ectoderm and endoderm, enclosing a central… …   English World dictionary

  • gastrula — n. (pl. gastrulae) Zool. an embryonic stage developing from the blastula. Etymology: mod.L f. Gk gaster gast(e)ros belly …   Useful english dictionary

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