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arachnoid Syllabification: a·rach·noid
Pronunciation: /əˈrakˌnoid/

Definition of arachnoid in English:


Like a spider or arachnid.
Example sentences
  • Watching the erstwhile nerd get used to his muscular new body and powers - accidentally firing off webs and finding things sticking to his arachnoid hands - is one of the most engaging parts of the film.
  • Results-wise, it's difficult to extrapolate from inferred arachnoid motivations to the human mental-state.
  • Their words paralyze me like the bite of an arachnoid.


(also arachnoid membrane or arachnoid mater) Anatomy Back to top  
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.
Example sentences
  • Between the pia and arachnoid membranes is the subarachnoid space, in which the cerebrospinal fluid circulates.
  • The lining consists of three layers - dura, arachnoid and pia.
  • The surgeon opens the arachnoid membrane dorsal to the seventh and eighth nerves and continues the opening upward to the fourth nerve.


Mid 18th century: from modern Latin arachnoides, from Greek arakhnoeidēs 'like a cobweb', from arakhnē 'spider'.

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