gastrulation


From The Collaborative International Dictionary of English v.0.48:

Gastrulation \Gas`tru*la"tion\ (g[a^]s`tr[.u]*l[=a]"sh[u^]n), n.
   (Biol.)
   The process of invagination, in embryonic development, by
   which a gastrula is formed.
   [1913 Webster]
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