WordReference Random House Learner's Dictionary of American English © 2017
e•lec•tro•lyte /ɪˈlɛktrəˌlaɪt/USA pronunciation   n. [countable]
  1. Chemistrya substance, usually a liquid, that allows electricity to pass or be passed through it.
See -lys-.
WordReference Random House Unabridged Dictionary of American English © 2017
e•lec•tro•lyte  (i lektrə līt′),USA pronunciation n. 
  1. Chemistry[Physical Chem.]
    • Also called  electrolytic conductor. a conducting medium in which the flow of current is accompanied by the movement of matter in the form of ions.
    • any substance that dissociates into ions when dissolved in a suitable medium or melted and thus forms a conductor of electricity.
  2. Physiologyany of certain inorganic compounds, mainly sodium, potassium, magnesium, calcium, chloride, and bicarbonate, that dissociate in biological fluids into ions capable of conducting electrical currents and constituting a major force in controlling fluid balance within the body.
  • electro- + -lyte 1825–35

Collins Concise English Dictionary © HarperCollins Publishers::

electrolyte /ɪˈlɛktrəʊˌlaɪt/ n
  1. a solution or molten substance that conducts electricity
  2. a chemical compound that dissociates in solution into ions
  3. any of the ions themselves

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