litmus test

Summary

Podcast Summary: Merriam-Webster's Word of the Day – "Litmus Test"

Release Date: June 21, 2025
Host: Merriam-Webster
Episode Title: Litmus Test

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Introduction to the Word of the Day: "Litmus Test"

In the June 21, 2025 episode of Merriam-Webster's "Word of the Day" podcast, hosted by Merriam-Webster experts, listeners are introduced to the term "litmus test." This episode delves into the meaning, usage, historical origins, and contemporary applications of the phrase, providing a comprehensive understanding of its significance in both scientific and figurative contexts.

Definition and Usage

At [00:42], the host defines "litmus test" as a noun, emphasizing its role in making judgments about acceptability based on specific criteria. The definition provided is:

"A litmus test is something, such as an opinion about a political or moral issue that is used to make a judgment about whether someone or something is acceptable."

To illustrate its usage, the host shares a sentence from The Hollywood Reporter, quoting Erica Henningsen:

"The audience in a Broadway show can be intoxicating, and it's like a litmus test. If a joke doesn't land one night, you tell it differently the next night. It's terrifying on set to have no idea if something is working." [00:59]

This example highlights the figurative application of a litmus test in evaluating the effectiveness of creative content based on audience reaction.

Historical Background

The podcast traces the origins of the term "litmus test" back to the 14th century, when scientists discovered that a litmus mixture—a combination of colored organic compounds derived from lichen—responded predictably to different pH levels. Specifically:

"A litmus mixture turns red in acid solutions and blue in alkaline solutions, thus serving as an acid-base indicator." [01:20]

This scientific application provided the foundational meaning of the term, which has since evolved to encompass broader evaluative criteria in various domains.

Contemporary Application and Example

Fast forward six centuries, the phrase "litmus test" has expanded beyond its scientific roots to describe any single factor that determines the true nature or categorization of something. The host elaborates:

"Figuratively, it can now refer to any single factor that establishes the true character of something or causes something to be assigned to one category or another." [01:50]

The earlier example from Erica Henningsen serves as a practical illustration of this figurative usage, demonstrating how a litmus test functions in real-world scenarios, such as performing arts, politics, and moral judgments.

Conclusion and Additional Resources

In wrapping up the episode, host Peter Sokolowski encourages listeners to further explore words and their meanings:

"Visit merriamwebster.com today for definitions, wordplay and trending word lookups." [02:16]

This invitation underscores the podcast's commitment to enriching listeners' vocabulary and understanding of language through daily word features.

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Key Takeaways:

• Litmus Test originated as a scientific term referring to a pH indicator derived from lichen.
• Over time, it has come to represent any definitive test or criterion used to assess the acceptability or true nature of a subject.
• The term is widely applicable in various fields, including politics, ethics, and the arts, serving as a benchmark for judgment and decision-making.

For those interested in expanding their word power, visiting Merriam-Webster's website offers a wealth of resources, including definitions, wordplay, and trending word lookups.

Transcript

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Today's word is litmus test spelled as two words L I T M U S T E S T Litmus test is a noun. A litmus test is something, such as an opinion about a political or moral issue that is used to make a judgment about whether someone or something is acceptable. Here's the word used in a sentence from the Hollywood Reporter quoting Erica Henningsen the audience in a Broadway show can be intoxicating, and it's like a litmus test. If a joke doesn't land one night, you tell it differently the next night. It's terrifying on set to have no idea if something is working. It was in the 14th century that scientists discovered that litmus mixture of colored organic compounds obtained from lichen turns red in acid solutions and blue in alkaline solutions and thus can be used as an acid base indicator. Six centuries later, people began using litmus test. Figuratively, it can now refer to any single factor that establishes the true character of something or causes something to be assigned to one category or another. Often it refers to something, such as an opinion about a political or moral issue, that can be used to make a judgment about whether someone or something is acceptable or not. With your Word of the day, I'm Peter Sokolowski.

[Peter Sokolowski]

Visit merriamwebster.com today for definitions, wordplay and trending. Word lookups.