Schizophrenia (noun)

1. A severe mental disorder characterized by a loss of contact with reality and an abnormal experience of the self, thoughts and emotions.
2. A condition that affects a person's ability to think, feel, behave, and perceive reality normally.

Origin:

Derived from the greek words 'schizo' meaning split and 'phren' meaning mind.

Examples:

1. John was diagnosed with schizophrenia and was having trouble distinguishing reality from his hallucinations.
2. Schizophrenia can cause disorganized thinking, auditory hallucinations, and delusions.
3. The disorder affects around 1% of the population globally.
4. The symptoms of schizophrenia can be managed with medication and therapy.
5. The causes of schizophrenia are still not fully understood, but it is thought to involve a combination of genetic and environmental factors.