Definition of arachnoid in English:

arachnoid

adjective

  • Like a spider or arachnid.

    ‘intelligent arachnoid killing machines’
    • ‘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.’
    • ‘The filmmakers really rushed the transition to arachnoid too quickly.’
    • ‘Oddly enough, if I know for certain that the scuttling thing isn't arachnoid in nature, it doesn't bother me in the slightest.’

Pronunciation

arachnoid

/əˈrakˌnoid/ /əˈrækˌnɔɪd/

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.

    ‘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.’

Pronunciation

arachnoid

/əˈrakˌnoid/ /əˈrækˌnɔɪd/

Origin

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