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Definition of arachnoid. 1  1 : of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater. 2  2 : covered with or composed of soft loose hairs or fibers.
(Patestas, 89-90) Also referred to as âarachnoidâ and âcranial arachnoid.â Subarachnoid Space: the space between the arachnoid and pia meninges of the brain and spinal cord, containing circulating cerebrospinal fluid and large blood vessels. (OxfordMed) The space is occupied by cerebrospinal fluid and is traversed by numerous arachnoid âtrabeculae.â (Patestas, 90)