Definition of abnormally adverb from the Oxford Advanced Learner's Dictionary

  

abnormally

 adverb
adverb
BrE BrE//æbˈnɔːməli//
 
; NAmE NAmE//æbˈnɔːrməli//
 
 
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in a way that is different from what is usual or expected, especially in a way that is worrying, harmful or not wanted abnormally high blood pressure