Usually means: Air-filled spaces around nasal cavity.
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We found 13 dictionaries that define the word paranasal sinus:

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

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

Medicine (4 matching dictionaries)
  1. paranasal sinus: Merriam-Webster Medical Dictionary
  2. Allergy Glossary (No longer online)
  3. paranasal sinus: Dictionary of Cancer Terms
  4. paranasal sinus: Medical dictionary

Definitions from Wiktionary (paranasal sinus)

noun:  (anatomy) Any of a number of air-filled spaces, or sinuses, within the bones of the skull and face.

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