psychosis
Concise Oxford English Dictionary © 2008 Oxford University Press:
psychosis /sʌɪˈkəʊsɪs/
▶noun (pl. psychoses /-siːz/) a mental disorder in which thought and emotions are so impaired that perception of external reality is severely affected.
– origin C19: from Gk psukhōsis ‘animation’, from psukhoō ‘I give life to’, from psukhē ‘soul, mind’.
'psychosis' also found in these Oxford entries:

