- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a test to establish the acidity or alkalinity of a mixture
- a critical indication of future success or failure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- A test for chemical acidity or basicity using litmus paper.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.