litmus test


noun

Chemistry. the use of litmus paper or solution to test the acidity or alkalinity of a solution.
a crucial and revealing test in which there is one decisive factor.

Origin of litmus test

First recorded in 1955–60; so called from chemical tests in which litmus or litmus paper is an indicator

British Dictionary definitions for litmus test

litmus test

noun

a test to establish the acidity or alkalinity of a mixture
a critical indication of future success or failure

Medical definitions for litmus test

litmus test

n.

A test for chemical acidity or basicity using litmus paper.