Wiktionary
n. The sac in which the foetus develops in mammals, reptiles and birds.
WordNet
Wikipedia
The amniotic sac, commonly called the bag of waters, sometimes the membranes, is the sac in which the fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth. The inner of these fetal membranes, the amnion, encloses the amniotic cavity, containing the amniotic fluid and the fetus. The outer membrane, the chorion, contains the amnion and is part of the placenta. On the outer side, the amniotic sac is connected to the yolk sac, to the allantois and, through the umbilical cord, to the placenta.
Amniocentesis is a medical procedure where fluid from the sac is sampled to be used in prenatal diagnosis of chromosomal abnormalities and fetal infections,
Usage examples of "amniotic sac".
The developing human being was about two centimeters long, floating inside a diaphanous fluid-filled amniotic sac the size of a plum.
But this amniotic sac is a highly specialized organ, different from any I’.
Ritter moved in with a vibra-scalpel, cutting through the thick felt mat of nutrient tubing with a touch so delicate the silvery amniotic sac beneath was unscored, then cut Miles free of his last bit of biological packaging, clearing his mouth and nose of fluids before his first surprised inhalation.
For an instant too short to measure, I felt as I had when the crash field had exploded around us in the tumbling spacecraft -- like a fetus struggling against a clinging amniotic sac.
For an instant too short to measure, I felt as I had when the crash field had exploded around us in the tumbling spacecraft- like a fetus struggling against a clinging amniotic sac.
Sterility obviously uncompromised, Ethan noted with satisfaction, and his touch with the scalpel had been so delicate that the silvery amniotic sac beneath the tubing was unscored.
Dropping the knife, and slipping the rope and flashlight into his pocket, Dale used his hands and fingernails to open the cut wider, tugging, clawing, and finally biting his way through the thin cotton like some predator chewing its way out of its own amniotic sac.
Ritter moved in with a vibra- scalpel, cutting through the thick felt mat of nutrient tubing with a touch so delicate the silvery amniotic sac beneath was unscored, then cut Miles free of his last bit of biological packaging, clearing his mouth and nose of fluids before his first surprised inhalation.
Julian said that labor could take a full day before her amniotic sac broke, even longer if the contractions weren’.
He was on his stomach, crawling through the collapsed lumen, the center, of the path the veins had taken back from the amniotic sac to the fetus.