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litmus test

   Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.01 sec.
litmus test 
1. Lit. a test used to determine the acidity or alkalinity of chemical substances. (Acid turns litmus paper red and alkaline compounds turn it blue.) I used a litmus test to show that the compound was slightly acid.
2. Fig. a question or experiment that seeks to determine the state of one important factor. His performance on the long exam served as a litmus test to determine whether he would go to college. The amount of white cells in my blood became the litmus test for diagnosing my disease.
See also: litmus, test


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Whether he allows his ministers to be prosecuted is being seen as a litmus test by the west.
We're so pleased and very proud that we have passed the ultimate litmus test," Philip tells Insider.
Protection of the Maldives and other low-lying areas will be the litmus test.
 
 
 
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