balneotherapy Syllabification: (bal·ne·o·ther·a·py)Pronunciation: /ˌbalnēəˈTHerəpē/Definition of balneotherapy noun the treatment of disease by bathing in mineral springs. Origin: late 19th century: from Latin balneum 'bath' + therapybalneotherapy in other Oxford dictionaries Definition of balneotherapy in the British & World English dictionary