psychosis Meaning, Definition & Usage

  1. noun any severe mental disorder in which contact with reality is lost or highly distorted

WordNet

Psy*cho"sis noun
Etymology
NL. See Psycho-.
Definitions
  1. Any vital action or activity. Mivart.
  2. (Med.) A disease of the mind; especially, a functional mental disorder, that is, one unattended with evident organic changes.

Webster 1913