from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A substance that indicates the degree of acidity or basicity of a solution through characteristic color changes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance that shows the acidity or alkalinity of a solution by its colour.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an indicator that changes color on going from acidic to basic solutions
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