psychosis n pl , -choses any form of severe mental disorder in which the individual's contact with reality becomes highly distorted Compare →
neurosis (C19: New Latin, from psycho- + -osis)
n a severe mental disorder characterized by extreme moods of either depression or mania
Korsakoff's psychosis , syndrome
n a mental illness involving severe confusion and inability to retain recent memories, usually caused by alcoholism
(C19: named after Sergei Korsakoff (1854--1900), Russian neuropsychiatrist, who described it)
n a severe mental illness produced by damage to the brain, as a result of poisoning, alcoholism, disease, etc.
n a mental disorder sometimes occurring in women after childbirth, characterized by deep depression, delusions of the child's death, and homicidal feelings towards the child