DIETETICS Meaning of DIETETICS in English di ‧ e ‧ tet ‧ ics /ˌdaɪəˈtetɪks/ BrE AmE noun [uncountable] the science that is concerned with what people eat and drink and how this affects their health Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012