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litmus
In a chemical context, this term refers specifically to the dye derived from lichens. It is almost exclusively used as an attributive noun to modify other words, such as in "litmus paper" or "litmus solution," rather than standing alone as a mass noun.
When used figuratively, it appears almost exclusively in the compound phrase "litmus test." This expression denotes a single, decisive criterion that determines whether something is acceptable or true. It carries a connotation of binary results—pass or fail, yes or no—leaving little room for nuance or middle ground.
Meanings
Examples
Dip the litmus paper into the solution to check the pH level.
The litmus paper turned red immediately upon contact with the acid.
We used a litmus test to determine if the liquid was alkaline.
This new policy will be the litmus test for the administration's commitment to reform.
Whether the public accepts this deal is the ultimate litmus test for the prime minister.
I wonder if this project will serve as a litmus test for our team's capability.
The candidate's stance on taxes acted as a litmus test for voters.
Let's see if he can handle this pressure; it is a perfect litmus test for his leadership.