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countable and uncountable, plural psychoses
(psychology) A severe mental disorder, sometimes with physical damage to the brain, marked by a deranged personality and a distorted view of reality. quotations
Manganism has been known about since the 19th century, when miners exposed to ores containing manganese […] began to totter, slur their speech and behave like someone inebriated. The poisoning was irreversible, and soon ended in psychosis and death.
2014 April 21, “Subtle effects”, in The Economist, volume 411, number 8884