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

sinusitis

noun
 
/ˌsaɪnəˈsaɪtɪs/
 
/ˌsaɪnəˈsaɪtɪs/
[uncountable]
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  1. the painful swelling of the sinuses
See sinusitis in the Oxford Advanced American Dictionary
Check pronunciation: sinusitis

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