Usually means: Vein connecting brain and heart.
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We found 7 dictionaries that define the word petrosal sinus:

General (3 matching dictionaries)
  1. petrosal sinus: Dictionary.com
  2. petrosal sinus, petrosal sinus (inferior), petrosal sinus (superior): TheFreeDictionary.com
  3. petrosal sinus: Wiktionary

Computing (1 matching dictionary)
  1. petrosal sinus, petrosal sinus (inferior), petrosal sinus (superior): Encyclopedia

Medicine (3 matching dictionaries)
  1. petrosal sinus: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. petrosal sinus, petrosal sinus (inferior), petrosal sinus (superior): Medical dictionary

Definitions from Wiktionary (petrosal sinus)

noun:  (anatomy) Either of two venous sinuses on each side of the base of the brain.

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