1. Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
   - amnion, amnios

Derived forms: amniotic sacs

Type of: sac

Part of: amniote, fetal membrane

Encyclopedia: Amniotic sac

• iritic
• iritis
• irk
• irksome
• irksomely
• iron
• iron age
• iron blue
• iron boot
• iron cage
• iron carbide
• Iron Chancellor
• iron collar
• iron curtain
• iron deficiency anaemia
• iron deficiency anemia
• iron disulfide
• Iron Duke
• iron filing
• iron fist
• iron foundry
• iron heel
• iron horse
• Iron Lady
• iron lung