noun, plural gas·tru·las, gas·tru·lae [gas-troo-lee] /ˈgæs trʊˌli/. Embryology.
Related formsgas·tru·lar, adjectivepre·gas·tru·lar, adjective
Examples from the Web for gastrula
But how is an adult worm or vertebrate formed out of such a gastrula?The Whence and the Whither of Man|John Mason Tyler
The cell-aggregate then differentiates into layers, and forms, in fact, a two-layered sac called a gastrula.Evolution|Joseph Le Conte
The two layers of the gastrula may now be spoken of as ectoderm and entoderm.The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
Gastrula: that embryonic stage resembling a sac, with an outer layer of epiblastic cells and an inner layer of hypoblastic cells.Explanation of Terms Used in Entomology|John. B. Smith
The formation of the gastrula and behaviour of the blastopore: together with the origin of the hypoblast.The Works of Francis Maitland Balfour, Volume III (of 4)|Francis Maitland Balfour