Definition of isotonic adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌaɪsəʊˈtɒnɪk//
; NAmE NAmE//ˌaɪsoʊˈtɑːnɪk//
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(of a drink) with added minerals and salts, intended to replace those lost during exercise Word Originearly 19th cent. (as a musical term designating a system of tuning, characterized by equal intervals): from Greek isotonos, from isos ‘equal’ + tonos ‘tone’.
See the Oxford Advanced American Dictionary entry: isotonic