litmus test

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• February 29. 2016 from wordnet.princeton.edu

  litmus test — noun — english

  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

• February 29. 2016 from wordnet.princeton.edu

  litmus test — noun — english

  a test that relies on a single indicator; "her litmus test for good breeding is whether you split infinitives"