/ saɪˈkəʊsɪs; NAmE -ˈkoʊ-/ noun
[ C , U ] ( pl. psych·oses / -siːz; NAmE /) a serious mental illness that affects the whole personality
—see also psychotic
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WORD ORIGIN
mid 19th cent.: from Greek psukhōsis animation, from psukhoō I give life to, from psukhē soul, mind.