Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: ab- 'away from, not' (from Latin ab- 'away, off') + normal

abnormal

adjective
     
ab‧norm‧al
very different from usual in a way that seems strange, worrying, wrong, or dangerous [≠ normal]:
abnormal behaviour
an abnormal level of cholesterol
My parents thought it was abnormal for a boy to be interested in ballet.
abnormally adverb:
an abnormally high pulse rate

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