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Noun
litmus
litmus test
Definition: 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
litmus test
Definition: a test that relies on a single indicator; "her litmus test for good breeding is whether you split infinitives"
Definition: A simple test for the acidity or alkalinity of a substance, using litmus paper.