What does "paranasal sinus" mean?

Any of a number of air-filled spaces, or sinuses, within the bones of the skull and face.

What is a synonym for "paranasal sinus"?

Common synonyms include: nasal sinus, sinus paranasales, sinuses.

noun

noun ·Rare ·Advanced level

Noun

1
Any of a number of air-filled spaces, or sinuses, within the bones of the skull and face.
2
any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities wordnet