amniotic sac   (TTS Sound)

The amniotic_sac has 1 Senses.

• amniotic sac, amnion, amnios
• 羊膜
• thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
• 高等脊椎動物（爬虫類、鳥類と哺乳類）の発育している胚を囲む薄いもっとも奥の膜状の嚢