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1. A test for chemical acidity or basicity using litmus paper.
2. A test that uses a single indicator to prompt a decision: "The word 'hopefully' has become the litmus test to determine whether one is a language snob or a language slob" (William Safire).
1. (Chemistry) a test to establish the acidity or alkalinity of a mixture
2. a critical indication of future success or failure
1. a test using litmus paper or solution to indicate the acidity or alkalinity of a solution.
2. a crucial test using a single issue or factor as the basis for judgment.
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|Noun||1.||litmus test - 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|
acid-base indicator - an indicator that changes color on going from acidic to basic solutions
litmus paper - unsized paper treated with litmus for use as an acid-base indicator
|2.||litmus test - a test that relies on a single indicator; "her litmus test for good breeding is whether you split infinitives"|