entypy

A type of gastrulation seen in some early mammalian embryos in which the endoderm covers the embryonic and amniotic ectoderm; part of the preplacental trophoblast may also be covered. [G. entype, pattern]

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en·ty·py 'ent-ə-pē n, pl -pies a method of amnion formation in certain mammals in which the inner cell mass invaginates into the yolk sac and no amniotic folds are formed

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en·ty·py (enґtə-pe) [Gr. entypē pattern] a method of gastrulation in which the endoderm lies external to the amniotic ectoderm.