Dura

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dura mater The outermost and toughest of the three membranes (meninges) that surround the central nervous system in vertebrates. It lies adjacent to the skull and its purpose is to protect the delicate inner meninges (the arachnoid membrane and the pia mater).

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dura mater outermost envelope of brain and spinal cord. XV. — medL., lit. ‘hard mother’, tr. Arab. al-'umm al-jalīda or al-jāfiya ‘the hard mother’; so called because it was thought to be the source of every other membrane in the body; cf. PIA MATER.
Hence dural XIX.

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du·ra ma·ter / ˈd(y)oŏrə ˈmätər; ˈmā-/ • n. see dura1 .

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dura (dura mater, pachymeninx) (dewr-ă) n. the thickest and outermost of the three meninges surrounding the brain and spinal cord.
dural adj.

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dura mater See MENINGES.