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arachnoid

Pronunciation: /əˈraknɔɪd/

Definition of arachnoid

adjective

like a spider or arachnid: intelligent arachnoid killing machines

noun

(also arachnoid membrane) Anatomy a fine, delicate membrane, the middle one of the three membranes or meninges that surround the brain and spinal cord, situated between the dura mater and the pia mater.