American Heritage® Dictionary of the English Language, Fourth Edition
- n. The membranous sac filled with amniotic fluid that protects a fetus during pregnancy. Also called bag of waters.
“On his fourth trip, he settled comfortably with water bag and lunch pouch in a fragrant flower-filled dell surrounded by sheer crags, sat down with his back against a grassy shelf, closed his eyes, and dozed.”
“He leaned up against the tree and undipped the water bag from the packframe.”
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