paranasal sinus(redirected from Air sinus)
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Related to Air sinus: frontal sinus
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|Noun||1.||paranasal sinus - any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities|
sinus - any of various air-filled cavities especially in the bones of the skull
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