ARACHNOID
- of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater
- a thin membrane of the brain and spinal cord [n ARACHNOIDS]
- like a cobweb [adj] / the arachnoid membrane, a fine delicate membrane which is the middle of the three meninges enveloping the brain and spinal cord [n -S]