Early 20th century (as a medical term denoting an adult with a mental age of about 8–12): from Greek mōron, neuter of mōros ‘foolish’.
Coined in 1910 by psychologist Henry H. Goddard, from Ancient Greek μωρός (mōrós, “foolish, dull”).
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Moroni (/məˈroʊnaɪ/), according to the Book of Mormon, was the last Nephite prophet, historian, and military commander who lived in the Americas in the late fourth and early fifth centuries. He is later known as the Angel Moroni, who presented the golden plates to Joseph Smith, who said he translated the plates upon which the Book of Mormon was originally written.