frontal sinus

noun

: either of two air spaces lined with mucous membrane each of which lies within the frontal bone above one of the orbits

Dictionary Entries Near frontal sinus

Cite this Entry

“Frontal sinus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/frontal%20sinus. Accessed 28 Nov. 2024.

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