litmus
Pronunciation
Noun
B1 Intermediate
Quick answer
A dye used to test whether a substance is acidic or basic, most often referenced through the phrase "litmus test."
Usage notes
A "litmus test" is a common figurative phrase for any single factor used to judge something quickly.
Test yourself
Which word fits the gap? "The strip of _____ turned pink, showing the solution was acidic."
Answer: litmus
In your own words, what does "litmus" mean?
A dye used to test whether a substance is acidic or basic, most often referenced through the phrase "litmus test."
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