| NOUN | substance | litmus test, litmus | a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions |
|---|---|---|---|
| communication | litmus test | a test that relies on a single indicator |
| Meaning | A coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator. | |
|---|---|---|
| Synonym | litmus | |
| Broader | acid-base indicator | An indicator that changes color on going from acidic to basic solutions |
| Substance of | litmus paper | unsized paper treated with litmus for use as an acid-base indicator |
| Spanish | tornasol | |
| Meaning | A test that relies on a single indicator. | |
|---|---|---|
| Example | "her litmus test for good breeding is whether you split infinitives" | |
| Broader | examination, exam, test | A set of questions or exercises evaluating skill or knowledge |
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