a test that uses one single indicator to help make a decision (the scientific meaning of a litmus test is a test for basic chemical properties that uses litmus paper)
The new sales policy was a litmus test for how the new manager would manage the department.
Fact
The spider used in the 2002 movie Spider-Man was a Steatoda spider, not a black widow. The spider was given anaesthesia, and was then painted blue and red .. More >>