Arabic

ḥiwalāˀ-, ḥūlāˀ-, ḥīlāˀ- - second membrane that comes out of the uterus at parturition and is filled with water (in camels) (BK 1 519)

PS
*ḥi(wa)l- - fetal membrane (SED I No. 130)
problematic both phonetically and semantically