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WordReference Random House Learner's Dictionary of American English © 2024ˈlit•mus ˌtest, n. [countable]- Chemistrya test for acidity or alkalinity using litmus paper.
- a crucial test using a single issue or factor as the basis for judgment:A candidate's honesty is the litmus test for the voters.
WordReference Random House Unabridged Dictionary of American English © 2024lit′mus test′, - Chemistrythe use of litmus paper or solution to test the acidity or alkalinity of a solution.
- a crucial and revealing test in which there is one decisive factor.
- so called from chemical tests in which litmus or litmus paper is an indicator 1955–60
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