(biology, embryology) The outer layer of a blastula that, after gastrulation, becomes the ectoderm.
1993, Oded Khaner, 5: Axis Determination in the Avian Embryo, Roger A. Pederson, Current Topics in Developmental Biology, Volume 28, Academic Press, page 171,
Hypoblasts from these stages were separated from the epiblasts and rotated 90 and 180°, relative to their posterior regions.
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