D defs.my
Entry 2 senses Webster, 1913

Psychosis

/sīk-ōs'-əs/ · Psy·cho·sis · IPA /saɪˈkoʊsɪs/
01 n. Any vital action or activity.
  1. 1.
    Any vital action or activity.
  2. 2.
    A disease of the mind; especially, a functional mental disorder, that is, one unattended with evident organic changes.(Med.)