paranasal sinus

noun

Medical Definition of paranasal sinus

: any of various sinuses (as the maxillary sinus and frontal sinus) in the bones of the face and head that are lined with mucous membrane derived from and continuous with the lining of the nasal cavity

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paranasal sinus

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Cite this Entry

“Paranasal sinus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/paranasal%20sinus. Accessed 27 May. 2022.

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