episode : Idioms & Phrases
acute schizophrenic episode
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noun schizophrenia of abrupt onset and relatively short duration (a few weeks or months)
reactive schizophrenia.
WordNet
major depressive episode
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noun (psychiatry) a state of depression with all the classic symptoms (anhedonia and lethargy and sleep disturbance and despondency and morbid thoughts and feelings of worthlessness and sometimes attempted suicide) but with no known organic dysfunction