Usually means: Air-filled cavity behind nose.
Definitions Related words Mentions
We found 10 dictionaries that define the word sphenoidal sinus:

General (5 matching dictionaries)
  1. Sphenoidal sinus, Sphenoidal sinus: InfoVisual Visual Dictionary
  2. sphenoidal sinus: Wiktionary
  3. sphenoidal sinus: Dictionary.com
  4. Sphenoidal sinus: Wikipedia, the Free Encyclopedia
  5. sphenoidal sinus: TheFreeDictionary.com

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

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

Definitions from Wiktionary (Sphenoidal sinus)

noun:  Alternative form of sphenoid sinus [(anatomy) A paranasal sinus contained within the body of the sphenoid bone.]

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