Moron is a term once used in psychology and psychiatry to denote mild intellectual disability.
[3] "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.
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.