not normal, average, typical, or usual; deviating from a standard: abnormal powers of concentration; an abnormal amount of snow; abnormal behavior.
extremely or excessively large: abnormal profit.

1850–55; ab- + normal; replacing anormal < Medieval Latin anōrmālus, variant of anōmālus anomalous influenced by Latin norma norm

abnormally, adverb
abnormalness, noun
superabnormal, adjective
superabnormally, adverb

abnormal, subnormal.

1. anomalous, aberrant, irregular, deviant, unnatural, odd. See irregular.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
abnormal (æbˈnɔːməl)
1.  not normal; deviating from the usual or typical; extraordinary
2.  informal odd in behaviour or appearance; strange
[C19: ab-1 + normal, replacing earlier anormal from Medieval Latin anormalus, a blend of Late Latin anōmalusanomalous + Latin abnormis departing from a rule]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1835, replaced older anormal and abnormous (1742) under influence of L. abnormis "deviating from a rule," from ab- "off, away from" + norma "rule" (see norm). The older forms were via O.Fr. anormal (13c.), from M.L. anormalos, from Gk. anomalos, from an- "not" + homalos, from
homos "same." The Gk. word was altered in Latin by association with norma.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Thrombocytopenia is any disorder in which there is an abnormally low amount of platelets.
Excessive volume of urination means that you release abnormally large amounts of urine each day.
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