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Definition of sinusitis noun from the Oxford Advanced Learner's Dictionary

sinusitis

noun

/ˌsaɪnəˈsaɪtɪs/

/ˌsaɪnəˈsaɪtɪs/

[uncountable]

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the painful swelling of the sinuses

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See sinusitis in the Oxford Advanced American Dictionary

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adjective

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