A thin, delicate membrane that is part of the three layers of the meninges surrounding the brain and spinal cord, situated between the dura mater and the pia mater.
The surgeon carefully examined the arachnoid to ensure there was no damage during the procedure.
arachnoidadjective
Resembling a spider's web; thin and delicate.
The arachnoid veil of mist hung over the valley, giving it an ethereal appearance.
Relating to the arachnoid membrane that envelops the brain and spinal cord between the dura mater and pia mater.
Inflammation of the arachnoid layer can lead to severe neurological symptoms.