"Moron" was coined in 1910 by psychologist Henry H. Goddard[4] from the Ancient Greek word μωρός (moros), which meant "dull"[5] and used to describe a person with a mental age in adulthood of between 7 and 10 on the Binet scale.[6] It was once applied to people with an intelligence quotient (IQ) of 51–70, being superior in one degree to "imbecile" (IQ of 26–50) and superior in two degrees to "idiot" (IQ of 0–25). The word moron, along with others including "idiotic", "imbecilic", "stupid", and "feeble-minded", was formerly considered a valid descriptor in the psychological community, but it is now deprecated in use by psychologists.[7]
In the obsolete medical classification (ICD-9, 1977), morons and feeble-minded persons were said to have "mild mental retardation", "mild mental subnormality" or "high-grade defect" with IQ in the range 50–70.[8]
Following opposition to Goddard's attempts to popularize his ideas,[9] Goddard recanted his earlier assertions about the moron: "It may still be objected that moron parents are likely to have imbecile or idiot children. There is not much evidence that this is the case. The danger is probably negligible."[10]
^Trent, James W. Jr. (2017). Inventing the Feeble Mind: A History of Intellectual Disability in the United States. Oxford University Press, ISBN978-0199396184
^μωρός, Henry George Liddell, Robert Scott, A Greek–English Lexicon, on Perseus Digital Library
^Zenderland, Leila (2001). Measuring Minds: Henry Herbert Goddard and the Origins of American Intelligence Testing. Cambridge University Press, ISBN978-0-521-00363-6