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Medical Definition of Paranasal sinuses
1. Air-filled extensions of the respiratory part of the nasal cavity into the frontal, ethmoid, sphenoid, and maxillary cranial bones. They vary in size and form in different individuals and are lined by the ciliated mucous membranes of the nasal cavity. (12 Dec 1998)
Lexicographical Neighbors of Paranasal Sinuses
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