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Definition of hay fever noun from the Oxford Advanced Learner's Dictionary

hay fever

noun
 
/ˈheɪ fiːvə(r)/
 
/ˈheɪ fiːvər/
[uncountable]
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  1. an illness that affects the nose, eyes and throat and is caused by pollen from plants that is breathed in from the airTopics Health problemsc1
See hay fever in the Oxford Advanced American Dictionary
trait
noun
 
 
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