subarachnoid space

Noun
  1. A space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid (synset 105490574)
    is a type of: space - an empty area (usually bounded in some way between things)
    is a part of: meninges, meninx - a membrane (one of 3) that envelops the brain and spinal cord

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