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We found 9 dictionaries that define the word arachnoids:

General (5 matching dictionaries)
  1. arachnoids: Merriam-Webster
  2. arachnoids: Collins English Dictionary
  3. arachnoids: Wiktionary
  4. arachnoids: Dictionary.com
  5. arachnoids: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. arachnoids: Encyclopedia

Medicine (2 matching dictionaries)
  1. arachnoids: Merriam-Webster Medical Dictionary
  2. arachnoids: Medical dictionary

Science (1 matching dictionary)
  1. ARACHNOIDS: Zoom Astronomy Glossary

(Note: See arachnoid 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.]
▸ Also see arachnoid


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