psychosis /saɪˈkoʊsəs/ noun plural psychoses /-ˈkoʊˌsiːz/ /saɪˈkoʊˌsiːz/ plural psychoses /-ˈkoʊˌsiːz/ /saɪˈkoʊˌsiːz/ Learner's definition of PSYCHOSIS
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: a very serious mental illness that makes you behave strangely or believe things that are not true精神病；精神失常；精神错乱