指し示じ薬やくしじやくMeanings1nounindicatorchemistryChemistry term for a substance that shows a change, such as a color change, to indicate a chemical condition (e.g., pH indicator).pH指し示じ薬やくを使つかって溶よう液えきの酸さん性せい度どを調しらべた。We checked the acidity of the solution using a pH indicator.
