# litmus test

> English word · Noun

## Definitions
1. A simple, binary test for the acidity or alkalinity of a substance, using litmus paper.
2. Any test which produces a binary, decisive result (for example, determining whether to appoint someone to a job) by measuring a single indicator.

## Etymology
From litmus + test.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/litmus-test