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In page Psychosis:
"The word psychosis was introduced to the psychiatric literature in 1841 by Karl Friedrich Canstatt in his work Handbuch der Medizinischen Klinik. He used it as a shorthand for 'psychic neurosis'. At that time neurosis meant any disease of the nervous system, and Canstatt was thus referring to what was considered a psychological manifestation of brain disease.[1] Ernst von Feuchtersleben is also widely credited as introducing the term in 1845,[2] as an alternative to insanity and mania.[citation needed]
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