This word is from the Spanish amnios.
amniyós
The amnion is a membrane that closely covers the human and various other embryos when first formed. It fills with amniotic fluid, which causes the amnion to expand and become the amniotic sac that provides a protective environment for the developing embryo.
KAHULUGAN SA TAGALOG
amniyós: kaloob-loobang lamad na bumabálot sa bilig ng isang reptil, ibon, o mammal
