electrolyte

noun

1. (countable, uncountable)A substance that, in solution or when molten, ionizes and conducts electricity.
2. (countable, uncountable)A solution containing such substances, which therefore also conducts electricity.

   “Some modern lead-acid batteries are sealed because they never need to have any electrolyte added during their service life.”

3. (countable, often, uncountable)Any of the various ions in such a solution, or (metonymically) their concentration therein.
4. (countable, often, uncountable)Any of the various ions in such a solution, or (metonymically) their concentration therein.

   “Lab tests to consider under these circumstances include serum electrolytes, serum glucose, and urine protein.”