Relating to or resembling the arachnoid membrane that surrounds the brain and spinal cord.
From 'arachnoid' (spider-web-like membrane) + '-al' (adjectival suffix). Used in medical and anatomical contexts to describe structures near or related to this membrane.
The arachnoid got its spider-web name because under magnification it shows delicate, gossamer-like fibers that look exactly like a spider's web!
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