Definitions for subarachnoid space
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Princeton's WordNet
subarachnoid space(noun)
a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid
Wiktionary
subarachnoid space(Noun)
The space between the arachnoid mater and the pia mater that surround the brain and spinal cord.
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