litmus test
definition: a test that relies on a single indicator
example: Their litmus test for a good friend was based on timeliness.
speech part: noun
synonyms:
definition: a coloring material, which is obtained from lichens, that turns red in acidic solutions and blue in alkaline solutions
example: We performed a litmus test in chemistry and discovered that the mystery solution was acidic based on the red color of the litmus.
speech part: noun
synonyms:
litmus