/ æbˈnɔːml; NAmE -ˈnɔːrml/ adjective
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 behaviour was abnormal.
OPP normal
► ab·nor·mal·ly / æbˈnɔːməli; NAmE -ˈnɔːrm-/ adverb :
abnormally high blood pressure
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WORD ORIGIN
mid 19th cent.: alteration (by association with Latin abnormis monstrous) of 16th-cent. anormal , from French , variant of anomal , via Latin from Greek anōmalos (from an- not + homalos even)