Psy‐cho″sis (?), n. [NL. See Psycho-.]
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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.