noun, plural: frontal sinuses
Either of a pair of paranasal sinuses situated between the inner and outer compact layers of the frontal bone, above the eyes. It communicates by the ethmoidal infundibulum with the middle meatus of the nasal cavity of the same side.
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... in my soft palate. I swear the salt water rinse channelled from my frontal sinus into my mouth. My fear is that if this bizarre critter can do that, it can enter the ...
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