2. (Anat.)
Defn: Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.
3. (Bot.)
Defn: Covered with, or composed of, soft, loose hairs or fibers, so as to resemble a cobweb; cobwebby.
ARACHNOID
A*rach"noid, n.
1. (Anat.)
Defn: The arachnoid membrane.
2. (Zoöl.)
Defn: One of the Arachnoidea.
ARACHNOIDAL
Ar`ach*noid"al, a. (Anat.)