circa 1881
: the double-walled fluid-filled sac that encloses and protects the fetus in the womb and that breaks releasing its fluid during the birth process
circa 1881
: the double-walled fluid-filled sac that encloses and protects the fetus in the womb and that breaks releasing its fluid during the birth process
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012