phrenopathy
/frɪˈnɒpəθi/noun
1Mental illness; an instance of this. Now rare.
2Cure of the mind (rare ); (especially in the terminology of W. F. Evans) cure of the body by the power of the healer's mind (in association with that of the patient). Compare mind cure. Now historical.
Origin
Mid 19th century (in an earlier sense). From phreno- + -pathy.