Definition of psychosis noun from the Oxford Advanced American Dictionary

 

psychosis

 noun
noun
NAmE//saɪˈkoʊsəs//
 
[countable, uncountable](pl. psychoses
NAmE//saɪˈkoʊsiz//
 
)
 
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a serious mental illness that affects the whole personality see also psychotic
See the Oxford Advanced Learner's Dictionary entry: psychosis