noun
dura mater; dura
Anatomical term for the tough outermost membrane covering the brain and spinal cord.
硬膜は脳と脊髄を保護する膜の一つです。
The dura mater is one of the membranes that protect the brain and spinal cord.
From 硬 (こう, 'hard') + 膜 (まく, 'membrane'), a straightforward kanji compound describing the tough outer membrane.