amniotic sac

(redirected from Birth sac)
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Related to Birth sac: yolk sac
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Synonyms for amniotic sac

thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

References in periodicals archive ?
Without separate placentas and birth sacs they are at risk of harming each other.
Mark said: "When the medics told us our twins shared the same birth sac we didn't know what we were letting ourselves in for.
Another one is peeking out from inside the pouch, and one more is still inside its pink birth sac.
Oh well, you should give Baby a shot of antibiotics anyway, and take the birth sac out of her pen, and.
Mark added: "When the medics told us our twins shared the same birth sac we didn't know what we were letting ourselves in for.