Usually means: Venous channel within the skull.
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We found 13 dictionaries that define the word sigmoid sinus:

General (8 matching dictionaries)
  1. sigmoid sinus: Vocabulary.com
  2. sigmoid sinus: Dictionary.com
  3. Sigmoid sinus: Wikipedia, the Free Encyclopedia
  4. sigmoid sinus: Rhymezone
  5. sigmoid sinus: FreeDictionary.org
  6. sigmoid sinus: Mnemonic Dictionary
  7. sigmoid sinus: TheFreeDictionary.com
  8. sigmoid sinus: Wiktionary

Computing (1 matching dictionary)
  1. sigmoid sinus: Encyclopedia

Medicine (4 matching dictionaries)
  1. sigmoid sinus: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. sigmoid sinus: Medical dictionary

Definitions from Wiktionary (sigmoid sinus)

noun:  (anatomy) A sinus on each side of the brain that is a continuation of the transverse sinus on the same side, follows an S-shaped course to the jugular foramen, and empties into the internal jugular vein.

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