[gas-troo-ley-shuh n] /ˌgæs trʊˈleɪ ʃən/

noun, Embryology.
the formation of a gastrula.
any process, as invagination, by which a blastula or other form of embryo is converted into a gastrula.
(embryol) the process in which a gastrula is formed from a blastula by the inward migration of cells

gastrulation gas·tru·la·tion (gās’trə-lā’shən)
Transformation of the blastula into the gastrula.


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