Usually means: Web-like membrane around brain.
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We found 30 dictionaries that define the word arachnoid:

General (21 matching dictionaries)
  1. arachnoid: Merriam-Webster
  2. arachnoid: Oxford Learner's Dictionaries
  3. arachnoid: American Heritage Dictionary of the English Language
  4. arachnoid: Collins English Dictionary
  5. arachnoid: Vocabulary.com
  6. arachnoid: Wordnik
  7. arachnoid: Wiktionary
  8. arachnoid: Webster's New World College Dictionary, 4th Ed.
  9. arachnoid: The Wordsmyth English Dictionary-Thesaurus
  10. arachnoid: Infoplease Dictionary
  11. arachnoid: Dictionary.com
  12. Arachnoid (astrogeology), Arachnoid (botany), Arachnoid (brain), Arachnoid: Wikipedia, the Free Encyclopedia
  13. Arachnoid: Online Plain Text English Dictionary
  14. arachnoid: Webster's Revised Unabridged, 1913 Edition
  15. arachnoid: Rhymezone
  16. Arachnoid: AllWords.com Multi-Lingual Dictionary
  17. arachnoid: Webster's 1828 Dictionary
  18. arachnoid: FreeDictionary.org
  19. arachnoid: Mnemonic Dictionary
  20. arachnoid: TheFreeDictionary.com
  21. arachnoid: Merriam-Webster

Computing (1 matching dictionary)
  1. arachnoid: Encyclopedia

Medicine (7 matching dictionaries)
  1. arachnoid: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Arachnoid: Gray's Anatomy (1918)
  5. Neurotrauma Glossary (No longer online)
  6. arachnoid: Medical Etymology Anatomy
  7. Arachnoid (brain), arachnoid: Medical dictionary

Science (1 matching dictionary)
  1. Botanical Terms (No longer online)

(Note: See arachnoids as well.)

Definitions from Wiktionary (arachnoid)

adjective:  Relating to or resembling spider webs; covered with or composed of soft loose hairs or fibers.
adjective:  (anatomy) Relating to the arachnoid mater.
noun:  (astronomy) A round network of fractures in the crust of Venus.
adjective:  (arachnology, relational) Relating to or resembling spiders.
noun:  An arachnid.
noun:  (neuroanatomy) Ellipsis of arachnoid mater.. [(anatomy) The middle layer of the meninges; a membrane that protects the brain and spinal cord below the dura mater and above the subarachnoid space and the pia mater.]

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