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litmus test is a noun 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". It carries 2 recorded senses.
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
a test that relies on a single indicator
“her litmus test for good breeding is whether you split infinitives”
Definitions, synonyms and semantic relations for litmus test come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.