allantois /ә'læntәuis/ 📖 中文释义 n. 尿囊[医] 尿囊 🔗 释义中的汉语词 尿囊 📘 English Definition（英文释义） n. the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) ← allantoinuria A 字母词表 allantois chorioidea →