dura mater (n.)youdaoicibaDictYouDict[dura mater 词源字典]
"tough outer membrane surrounding the brain," c. 1400, from Medieval Latin dura mater cerebri, literally "hard mother of the brain," a loan-translation of Arabic umm al-dimagh as-safiqa, literally "thick mother of the brain." "In Arabic, the words 'father,' 'mother,' and 'son' are often used to denote relationships between things" [Klein].[dura mater etymology, dura mater origin, 英语词源]