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Related to amniotic sac: placenta, amniotic fluid, yolk sac


see Sac and FoxSac and Fox,
closely related Native Americans of the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). Sac and Fox culture was of the Eastern Woodlands area with some Plains-area traits (see under Natives, North American).
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A soft-walled cavity within a plant or animal, often containing a special fluid and usually having a narrow opening or none at all.
Indentation in the contour lines of equal depth showing submarine relief.


a pouch, bag, or pouchlike part in an animal or plant


1. An early system on the Datatron 200 series.

[Listed in CACM 2(5):16 (May 1959)].
References in periodicals archive ?
Moore, MD, of Case Western Reserve University and MetroHealth Medical Center in Cleveland, is working to understand what causes weakening of the amniotic sac (bag of waters) and preterm premature rupture of the membranes (PPROM).
The amniotic sac is the thin membrane filled with fluid which keeps a baby warm and safe from bumps during pregnancy.
There several health risks for monoamniotic twins due to the closeness within the amniotic sac.
Young babies tend to have natural instinct to swim because their first environment inside their mothers' womb was also surrounded with water called the amniotic sac.
On September 3, the zoo's senior female Tapir Rinny gave bith to a tiny baby, but keepers watching on CCTV realised she could not break the amniotic sac.
The brain is very large and heavy in relation to the body but is cushioned in the amniotic sac.
This next one was echoed by an "object" on last Sunday's Antiques Roadshow: the dried and preserved amniotic sac or filmy membrane taken from a new-born baby.
Until now, invasive methods for prenatal diagnosis of the syndrome have required the use of a needle entering through the abdominal wall, the wall of the uterus and amniotic sac to get a sample of the foetus.
That Friday morning, Sheikh said she reported to Partner that the water from her baby's amniotic sac had broken.
That the implanted cells were not rejected is likely because the amniotic sac is a barrier between a woman and her developing fetus, the researchers observed.