| NOUN | substance | absorption indicator | an indicator used in reactions that involve precipitation |
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| Meaning | An indicator used in reactions that involve precipitation. | |
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| Narrower | fluorescein, fluoresceine, fluorescent dye, resorcinolphthalein | A yellow dye that is visible even when highly diluted |
| Broader | indicator | (chemistry) a substance that changes color to indicate the presence of some ion or substance |