litmus test

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Definition
  1. Noun:
    • A decisive test that produces a clear positive or negative result based on a single, crucial factor: A "litmus test" is a metaphor for a simple, definitive check used to make a judgment or classification. It originates from chemistry but is commonly used figuratively.
    • (Chemistry) A dye obtained from lichens used as an acid-base indicator: In its literal scientific sense, it is a coloring material that turns red in acidic conditions and blue in alkaline conditions, providing a basic test for pH.
Usage Examples
  • Noun (Figurative):
    • For many voters, a candidate's position on healthcare is the litmus test.
    • His litmus test for a good restaurant is the quality of its bread.
  • Noun (Literal/Chemistry):
    • We used litmus test paper to determine if the solution was acidic.
    • The classic litmus test involves dipping paper into a liquid to see if it turns red or blue.
Advanced Usage
  • "To serve as a litmus test for": To function as the defining criterion for something.
    • Public reaction to the policy will serve as a litmus test for its future viability.
  • "To apply a litmus test to": To judge or evaluate something using a single, decisive standard.
    • The committee applied a strict litmus test to all funding applications.
Variants and Related Words
  • Litmus paper (n): Paper impregnated with litmus, used for quick acid-base tests.
    • The scientist tore off a strip of litmus paper.
  • Litmus (n): The dye itself.
    • Litmus is derived from various lichen species.
Synonyms
  • Benchmark: A standard or point of reference.
  • Criterion: A principle or standard by which something is judged.
  • Indicator: A thing that shows the state or level of something.
  • Acid test: A conclusive test of value or quality (also derived from chemistry).
Related Idioms/Phrases
  • "Pass/fail the litmus test": To meet or not meet the decisive standard.
    • The new design failed the boss's litmus test for simplicity.
  • "The ultimate litmus test": The most important and definitive criterion.
    • Customer satisfaction is the ultimate litmus test for any business.
Noun
  1. a test that relies on a single indicator
    • her litmus test for good breeding is whether you split infinitives
  2. 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

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