electrolyte

noun

Etymology: From electro- + -lyte, from electrolysis. Coined by British scientist Michael Faraday in 1834.

1. A substance that, in solution or when molten, ionizes and conducts electricity.
2. 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. Any of the various ions in such a solution, or (metonymically) their concentration therein.
4. 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.”