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Definition of Arachnoid mater
1. Noun. (anatomy) The middle layer of the meninges. A membrane that protects the brain and spinal cord below the dura mater and above the subarachnoid space and the pia mater. ¹
¹ Source: wiktionary.com
Medical Definition of Arachnoid mater
1. Like a cobweb, covered with or consisting of soft fibres or hairs so entangled as to give a cobwebby appearance. (09 Oct 1997)