Definition of abnormal adjective from the Oxford Advanced American Dictionary

  

abnormal

 adjective
adjective
NAmE//æbˈnɔrml//
 
 
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different from what is usual or expected, especially in a way that is worrying, harmful, or not wanted abnormal levels of sugar in the blood They thought his behavior was abnormal. The ship was blown off course by abnormal weather conditions. opposite normal
NAmE//‑məli//
 
adverb abnormally high blood pressure
See the Oxford Advanced Learner's Dictionary entry: abnormal