Psychosis (noun)

1. A severe mental disorder characterized by a breakdown of thought processes and by poor emotional responsiveness.
2. A severe mental illness characterized by a detachment from reality.

Origin:

From greek psychosis "mind, soul".

Examples:

1. The patient was diagnosed with psychosis and schizophrenia.
2. The psychosis caused the patient to have hallucinations and delusions.
3. The patient's psychosis was triggered by a traumatic event.
4. The symptoms of the patient's psychosis included disordered thinking and abnormal behavior.
5. The patient's psychosis was treated with a combination of medication and therapy.