Meaning of ABNORMAL in English

ABNORMAL

[adjective] - different from what is usual or average, esp. in a way that is not desirableabnormal behaviour/weather/conditionsTests have shown that he has an abnormal heart rhythm/some abnormal skin cells.Like many pregnant women, she's worried that her baby might be born abnormal.

Cambridge English vocab.      Кембриджский английский словарь.