(psychiatry)short for catatonicschizophrenic, a very fancy word which means a person is in a state where he lies still, stiff and never moves. A schizophrenic is a person suffering from schizophrenia, meaning "a severe mental disorder in which a person becomes unable to act or reason in a rational way." Catatonic refers to a seizure in which a person becomes rigid and unconscious. —PDC Volume 4 Approved Glossary