Definitions

1. adjective

relating to or situated between the arachnoid and pia mater layers of the meninges.

“The subarachnoid hemorrhage was caused by the rupture of an aneurysm.”

2. noun

a space or layer between the arachnoid and pia mater layers of the meninges.

“The doctor ordered a CT scan to check for subarachnoid bleeding.”

3. adjective

relating to or situated below the arachnoid layer of the meninges.

“The subarachnoid space was filled with cerebrospinal fluid.”