Definition of postviral syndrome noun from the Oxford Advanced Learner's Dictionary

 

postviral syndrome

 noun
noun
BrE BrE//ˌpəʊstˈvaɪrəl sɪndrəʊm//
 
; NAmE NAmE//ˌpoʊstˈvaɪrəl sɪndroʊm//
 
(also postviral fatigue syndrome)[uncountable]
 
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a condition that follows a viral infection, in which somebody feels extremely weak and tired, and which can last for a long time