noun
a hollow cavity within a bone or other tissue, especially one in the bones of the face connected to the nasal cavities.
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The doctor diagnosed her with a sinus infection and prescribed antibiotics.
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I can't come to the party tonight, I have a bad sinus headache.
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My sinuses are killing me today, I can't stop sneezing.
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The congestion in the city was like a sinus blockage, causing traffic to come to a standstill.