Share this entry
arachnoid Line breaks: arach|noid
Pronunciation: /əˈraknɔɪd/

Definition of arachnoid in English:


Like a spider or arachnid: intelligent arachnoid killing machines
More 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.


Back to top  
(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.
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'.

Definition of arachnoid in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources

Related Words