[suhb-nawr-muh l]
See more synonyms for subnormal on
  1. below the normal; less than or inferior to the normal: a subnormal amount of rain.
  2. being less than average in any psychological trait, as intelligence, personality, or emotional adjustment.
  1. a subnormal person.
  2. Geometry. that part of the x-axis of a curve cut off between the ordinate and a normal.

Origin of subnormal

First recorded in 1700–10; sub- + normal
Related formssub·nor·mal·i·ty, noun
Can be confusedabnormal subnormal Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for subnormal

Historical Examples of subnormal

British Dictionary definitions for subnormal


  1. less than the normal
  2. having a low intelligence, esp having an IQ of less than 70
  1. a subnormal person
Derived Formssubnormality (ˌsʌbnɔːˈmælɪtɪ), nounsubnormally, adverb
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 subnormal

1890, from sub- + normal. The noun is from 1710 in geometry; 1916, of persons.

Online Etymology Dictionary, © 2010 Douglas Harper