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Adjective: subarachnoid  ,sub-u'rak-noyd
  1. (anatomy) located or occurring beneath the arachnoid membrane of the brain or spinal cord
    "The subarachnoid space contains cerebrospinal fluid"
Noun: subarachnoid  ,sub-u'rak-noyd
  1. (anatomy) the space between the arachnoid membrane and the pia mater in the brain and spinal cord
    "A subarachnoid haemorrhage can be life-threatening"

Encyclopedia: Subarachnoid