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

 

torpor

 noun
noun
BrE BrE//ˈtɔːpə(r)//
 
; NAmE NAmE//ˈtɔːrpər//
 
[uncountable, singular](formal)
 
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the state of not being active and having no energy or enthusiasm synonym lethargy In the heat they sank into a state of torpor. Word Origin late Middle English: from Latin, from torpere ‘be numb or sluggish’.
See the Oxford Advanced American Dictionary entry: torpor