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litmus test

   Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia, Hutchinson 0.03 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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Investors viewed the IPO as a crucial litmus test to determine whether other hedge funds will follow Fortress onto the stock market.
Perhaps nothing better exemplified the district than 7 World Trade Center, whose leasing success many considered a litmus test for the long-term prospects of the district and the need for the millions of squaree feet of new office space planned at the WTC site.
revenue be spent on development in Mexico versus protecting our national borders, is a pretty telling litmus test of what passes for diplomacy out of Mexico.
 
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