sphenoid sinus

noun
variants: or sphenoidal sinus

Medical Definition of sphenoid sinus

: either of two irregular cavities in the body of the sphenoid bone that communicate with the nasal cavities

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Cite this Entry

“Sphenoid sinus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/sphenoid%20sinus. Accessed 23 Nov. 2020.

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