I. (ˌ)ab-ˈnȯr-məl, əb- adjective
Etymology: alteration of French anormal, from Medieval Latin anormalis, from Latin a- + Late Latin normalis normal
Date: circa 1836
: deviating from the normal or average : unusual , exceptional
abnormal behavior
• ab·nor·mal·ly -mə-lē adverb
II. noun
Date: 1912
: an abnormal person