bag of waters

American  

noun

1. a fluid-filled membranous sac in the pregnant uterus that encloses and cushions the fetus, normally breaking at or just before the time of birth; the amnion.

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Etymology

Origin of bag of waters

First recorded in 1880–85

Example Sentences

Wood reports a case in which there was expulsion of a bag of waters before the rupture of the membranes.

From Anomalies and Curiosities of Medicine by Pyle, Walter L. (Walter Lytle)

The fœtus, preceded by the bag of waters, then descends through the vagina or birth canal until it comes to the external opening of the vagina.

From Herself Talks with Women Concerning Themselves by Lowry, Edith B. (Edith Belle)

The bag of waters is the sac of membranes in which the child is inclosed.

From The Four Epochs of Woman's Life; a study in hygiene by Galbraith, Anna M. (Anna Mary)

About this time the bag of waters usually bursts, and, as a66 rule, this marks the beginning of the "second stage of labor."

From The Mother and Her Child by Sadler, William S.

The bag of waters helps dilate the parts much easier than the fœtus could do it alone.

From Herself Talks with Women Concerning Themselves by Lowry, Edith B. (Edith Belle)