subarachnoid space

Medical Dictionary

subarachnoid space sub·a·rach·noid space (sŭb'ə-rāk'noid')
n.
The space between the arachnoid membrane and pia mater; that is filled with cerebrospinal fluid and contains the large blood vessels that supply the brain and spinal cord.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
subarachnoid space

noun
a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid 
WordNet® 3.0, © 2006 by Princeton University.
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