psychogeriatricsPronunciation: /ˌsʌɪkəʊdʒɛrɪˈatrɪks/Definition of psychogeriatrics noun [treated as singular] the branch of health care concerned with mental illness in elderly people. Derivatives psychogeriatric adjective psychogeriatrician noun psychogeriatrics in other Oxford dictionaries Definition of psychogeriatrics in the US English dictionary