"tough outer membrane surrounding the brain," c.1400, from M.L. dura mater cerebri, lit. "hard mother of the brain," a loan-transl. of Ar. umm al-dimagh as-safiqa, lit. "thick mother of the brain." "In Arabic, the words 'father,' 'mother,' and 'son' are often used to denote relationships between things" [Klein].
(dr'ə mā'tər, mä'-) The tough fibrous membrane covering the brain and the spinal cord and lining the inner surface of the skull. It is the outermost of the three membranes (meninges) that surround the central nervous system, overlying the arachnoid and pia mater.