PSYCHOSIS
psychosis
(noun) any severe mental disorder in which contact with reality is lost or highly distorted
Source: WordNet® 3.1
Etymology
Noun
psychosis (countable and uncountable, plural psychoses)
(psychology) A severe mental disorder, sometimes with physical damage to the brain, marked by a deranged personality and a distorted view of reality.
Source: Wiktionary
Psy*cho"sis, n. Etym: [NL. See Psycho-.]
1. Any vital action or activity. Mivart.
2. (Med.)
Definition: A disease of the mind; especially, a functional mental
disorder, that is, one unattended with evident organic changes.
Source: Webster’s Unabridged Dictionary 1913 Edition