Definition of arachnoids:
(adj) :
(anatomy) Relating to the arachnoid mater.
(adj) :
(arachnology, relational) Relating to or resembling spiders.
(adj) :
Relating to or resembling spider webs; covered with or composed of soft loose hairs or fibers.
(n) :
(astronomy) A round network of fractures in the crust of Venus.
(n) :
An arachnid.
(n) :
(neuroanatomy) Ellipsis of arachnoid mater. [(anatomy) The middle layer of the meninges; a membrane that protects the brain and spinal cord below the dura mater and above the subarachnoid space and the pia mater.]