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

tinnitus

noun
 
/ˈtɪnɪtəs/
 
/ˈtɪnɪtəs/
[uncountable] (medical)
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  1. an unpleasant condition in which somebody hears ringing in their ears
    Word Originmid 19th cent.: from Latin, from tinnire ‘to ring, tinkle’, of imitative origin.
See tinnitus in the Oxford Advanced American Dictionary
hat-trick
noun
 
 
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