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abnormal

[ab-nawr-muh l]
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adjective
  1. not normal, average, typical, or usual; deviating from a standard: abnormal powers of concentration; an abnormal amount of snow; abnormal behavior.
  2. extremely or excessively large: abnormal profit.
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Origin of abnormal

1850–55; ab- + normal; replacing anormal < Medieval Latin anōrmālus, variant of anōmālus anomalous influenced by Latin norma norm
Related formsab·nor·mal·ly, adverbab·nor·mal·ness, nounsu·per·ab·nor·mal, adjectivesu·per·ab·nor·mal·ly, adverb
Can be confusedabnormal subnormal

Synonyms

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1. anomalous, aberrant, irregular, deviant, unnatural, odd. See irregular.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for abnormal

abnormal

adjective
  1. not normal; deviating from the usual or typical; extraordinary
  2. informal odd in behaviour or appearance; strange
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Derived Formsabnormally, adverb

Word Origin

C19: ab- 1 + normal, replacing earlier anormal from Medieval Latin anormalus, a blend of Late Latin anōmalus anomalous + Latin abnormis departing from a rule
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for abnormal

adj.

1835, displaced older abnormous (1742) and rival anormal (1835) under influence of Latin abnormis "deviating from a rule," from ab- "off, away from" (see ab-) + norma "rule" (see norm). The older forms were via Old French anormal (13c.), from Medieval Latin anormalos, from Greek anomalos, from an- "not" + homalos, from homos "same." The Greek word was altered in Latin by association with norma. Related: Abnormally.

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Online Etymology Dictionary, © 2010 Douglas Harper