Paper stained with litmus, used to indicate the acidity or alkalinity of a substance. Blue litmus paper turns red under acid conditions, and red litmus paper turns blue under alkaline conditions.
- ‘The litmus paper is still the litmus paper,’ he enunciated in the formal manner of the lecturer.
- Blue litmus paper turns red in acidic solution, and red litmus paper turns blue in basic solution.
- Earth's greatest scientists work around the clock to avert disaster, finally resolving the problem with the careful use of test tubes, Bunsen burners, and litmus paper.
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Syllabification: lit·mus pa·per
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