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

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)

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)

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 in which the baby is enclosed throughout the pregnancy may have broken at the beginning of labor, before or during the first stage.

From Emergency Childbirth A Reference Guide for Students of the Medical Self-help Training Course, Lesson No. 11 by United States. Office of Civil Defense

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)