isotonic

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i·so·ton·ic / ˌīsəˈtänik/ • adj. Physiol. 1. (of muscle action) taking place with normal contraction.2. denoting or relating to a solution having the same osmotic pressure as some other solution, esp. one in a cell or a body fluid. ∎  (of a drink) containing essential salts and minerals in the same concentration as in the body and intended to replace those lost as a result of sweating during vigorous exercise.DERIVATIVES: i·so·ton·i·cal·ly / -ik(ə)lē/ adv.i·so·to·nic·i·ty / -təˈnisitē/ n.

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