- (a.) Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.
- (a.) Resembling a spider's web; cobweblike.
- (n.) The arachnoid membrane.
- (a.) Covered with or composed of, soft, loose hairs or fibers, so as to resemble a cobweb; cobwebby.
- (n.) One of the Arachnoidea.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). arachnoid. Retrieved September 25, 2026, from http://smartdefine.org/arachnoid/definitions/1975410 |
| Chicago | Webster's. 2011. "arachnoid" http://smartdefine.org/arachnoid/definitions/1975410 (accessed September 25, 2026). |
| Harvard | Webster's 2011, arachnoid, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/arachnoid/definitions/1975410>. |
| MLA | Webster's. "arachnoid" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/arachnoid/definitions/1975410> |