Arachnoid

Origin

Ancient Greek ἀράχνη ("spider") + -oid

Full definition of arachnoid

Adjective

1. Relating to spiders.
2. Relating to or resembling spider webs.
3. (anatomy) Relating to the arachnoid mater, the middle layer of the meninges, the three membranes that protect the brain.

Noun

1. (biology) An arachnid
2. (physiology) The arachnoid mater, the middle layer of the meninges, the three membranes that protect the brain
3. (astronomy) A round network of fractures in the crust of Venus