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

 

ague

 noun
noun
BrE BrE//ˈeɪɡjuː//
 
; NAmE NAmE//ˈeɪɡjuː//
 
[uncountable](old-fashioned)
 
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a disease such as malaria that causes fever and shivering (= shaking of the body) Word Origin Middle English: via Old French from medieval Latin acuta (febris) ‘acute (fever)’.
See the Oxford Advanced American Dictionary entry: ague