Definition of "arachnoid"

Relating to or resembling spider webs; covered with or composed of soft loose hairs or fibers.  examples

(anatomy) Relating to the arachnoid mater.  examples

(neuroanatomy) Ellipsis of arachnoid mater..  examples

(astronomy) A round network of fractures in the crust of Venus.  examples

(arachnology, relational) Relating to or resembling spiders.

An arachnid.  examples