Litmus-test definitions

A test for chemical acidity or basicity using litmus paper.
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A test using litmus, esp. litmus paper, to determine whether a solution is an acid or a base.
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A test that uses a single indicator to prompt a decision.
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Any factor regarded as the decisive criterion in assessing the quality or authenticity of someone or something.
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(chemistry) A simple test for the acidity or alkalinity of a substance, using litmus paper.
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(figuratively, by extension) Any test which produces a decisive result by measuring a single indicator.
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Origin of litmus-test

From litmus + test.