1. arachnoid

adjective. relating to or resembling a member of the class Arachnida.


  • arachnidian
  • spiderlike
  • spiderly

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2. arachnoid

noun. the middle of the 3 meninges.


  • meninges
  • leptomeninges
  • arachnoid membrane

3. arachnoid

noun. air-breathing arthropods characterized by simple eyes and four pairs of legs.


  • spider
  • arachnid
  • false scorpion
  • whip scorpion
  • acarine
  • pseudoscorpion
  • Phalangium opilio
  • whip-scorpion
  • Arachnida
  • scorpion
  • class Arachnida
  • arthropod
  • daddy longlegs

Sentences with arachnoid

1. Verb, past participle
Think cobwebs, and you have arachnoid plant hairs that often tinge plants with gray.

2. Adjective
The second layer is the arachnoid layer; it is a loose connective tissue layer that resembles the web of a spider.

3. Noun, singular or mass
Meningitis, a swelling of the membranes covering the brain, may also cause secondary arachnoid cysts to develop.