orthopsychiatryPronunciation: /ˌɔːθəʊsʌɪˈkʌɪətri/Definition of orthopsychiatry noun [mass noun] the branch of psychiatry concerned with the prevention of mental or behavioural disorders, especially by studying borderline cases. Derivatives orthopsychiatric adjective orthopsychiatrist noun orthopsychiatry in other Oxford dictionaries Definition of orthopsychiatry in the US English dictionary