Main Entry: psy·cho·sis

Pronunciation: \sī-ˈkō-səs\

Function: noun

Inflected Form(s): plural psy·cho·ses \-ˌsēz\

Etymology: New Latin

Date: 1847

: fundamental derangement of the mind (as in schizophrenia) characterized by defective or lost contact with reality especially as evidenced by delusions, hallucinations, and disorganized speech and behavior