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1. (Anatomy)
The dura mater, the outer covering of the brain and spinal cord. (

2. Dura mater. The outermost (and toughest) of the 3 meninges. (

3. A thin membrane that is the outermost of the three layers of the meninges that surround the brain and spinal cord. It is derived from mesoderm. (

Word Origin: Latin Fem. Of durus, hard

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