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(medicine) Inside the womb, but outside the embryo. quotations examples
Subsequent cell and tissue interactions lead to the functional differentiation of all embryonic and extraembryonic tissues.
1998, Julian Lombardi, Comparative Vertebrate Reproduction, Springer, page 237
The clockwise beating of cilia results in a net flow of extraembryonic fluid leftwards […]
2006, Manfred Schliwa, Molecular Motors, page 359