i‧so‧ton‧ic drink /ˌaɪsətɒnɪk ˈdrɪŋk $ -tɑː-/ noun [countable]
a drink made especially for people who are exercising or playing sport, containing electrolytes which help your body take in liquid effectively, and carbohydrates that give your body extra energy

[TahlilGaran] Dictionary of Contemporary English ▲