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preplacental
preplacental adj.
Brit. 
/ˌpriːpləˈsɛntl/
, /ˌpriːpləˈsɛntl/U.S. /ˌpripləˈsɛn(t)l/
Biology occurring or existing prior to the development of the placenta during pregnancy./ˌpripləˈsɛn(t)l/ΚΠ
1889 Amer. Naturalist 23 926 The preplacental absorption of food by the embryos of placentalian mammals.
1975 Jrnl. Embryol. & Exper. Morphol. 34 633 Mouse chorioallantoic pre-placental structures alone or in association with the embryo were explanted during the 9th day of gestation.
1996 Proc. National Acad. Sci. U.S.A. 93 3313/2 Consequentially, the loss of RARβ2 promoter activity demonstrates that RA synthesis in the preplacental embryo requires yolk-sac-derived RBP.
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