The plural of dura, the tough outermost membrane that surrounds and protects the brain and spinal cord.
From Medieval Latin 'dura mater,' literally meaning 'hard mother,' from Latin 'durus' (hard). The membrane was named 'hard mother' in contrast to the 'soft mother' (pia mater) that lies beneath it.
Your brain is basically floating in a sack of cerebrospinal fluid surrounded by three membranes, with the dura as the tough outer skin—it's like your brain is wearing a wetsuit inside a leather jacket inside a hardshell case.
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