amnion (n.)youdaoicibaDictYouDict[amnion 词源字典]
1660s, Modern Latin, from Greek amnion "membrane around a fetus," said to be originally "bowl in which the blood of victims was caught" [Liddell & Scott], which is variously said to be of unknown origin, from ame "bucket," or a diminutive of amnos "lamb."[amnion etymology, amnion origin, 英语词源]