meninges

Concise Oxford English Dictionary © 2008 Oxford University Press:
meninges /mɪˈnɪndʒiːz/

▶plural noun (sing. meninx) Anatomy the three membranes (the dura mater, arachnoid, and pia mater) that line the skull and vertebral canal and enclose the brain and spinal cord.

– derivatives
meningeal adjective.

– origin mod. L., from Gk mēninx, mēning- ‘membrane’.