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/ˈlɪtməs/ · noun
(uncountable) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels..
Use litmus when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Litmus means (uncountable) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels..
Common synonyms include lacmus, indicator, litmus paper.
The opposite depends on the specific sense.
Use litmus where its definition matches the intended context.
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