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litmus test

noun
1.
Chemistry. the use of litmus paper or solution to test the acidity or alkalinity of a solution.
2.
a crucial and revealing test in which there is one decisive factor.
Origin
1955-1960
1955-60; so called from chemical tests in which litmus or litmus paper is an indicator
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for litmus-test

litmus test

noun
1.
a test to establish the acidity or alkalinity of a mixture
2.
a critical indication of future success or failure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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litmus-test in Medicine

litmus test n.
A test for chemical acidity or basicity using litmus paper.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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