What does arachnoid mean?
The definition of arachnoid
A*rach”noid, a.
Etym: [Gr.

1 Resembling a spider’s web; cobweblike.
2 (Anat.)
Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.
3 (Bot.)
Covered with, or composed of, soft, loose hairs or fibers, so as to resemble a cobweb; cobwebby.

A*rach”noid, n.
1 (Anat.)
The arachnoid membrane.
2 (Zoöl.)
One of the Arachnoidea.