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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 ?
T1- and T2-weighted images in three planes can confirm gestational sac location and assess degree of myometrial invasion.
Between subjects who had positive results for [beta]hCG test, gestational sac was developed among all pregnant individuals in the first group (Intervention) but 2 out of 8 pregnant patients of the control group (25%) didn't develop the gestational sac.
The yolk sac and foetal pole were also noted within the gestational sac.
A gestational sac in the anterior part of the uterine isthmus.
The gestational sac is identified and its proximity to the bladder demonstrated with the IDC balloon insitu.
Certain sonographic features predict early pregnancy failure like gestational sac more then 20 mm size with no yolk sac or sac more then 25 mm with no embryo - favorsBlighted Ovum.
The distance between the external cervical os and the leading edge of the gestational sac ranged from 7 to 25 mm.
Gestational ages (GA) by scan were determined by measuring the biparietal diameter (BPD) and the femur length (FL) or Gestational Sac (GS).
A baby is not always present and the cells that line the gestational sac begin to convert into a growth resembling a cluster of watery grapes, thus signifying an abnormal placenta - hydatid literally means a watery cyst.
Ortiz saw an irregular tear-shaped gestational sac that apparently was without a fetal pole or a heart beat.

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