litmus

/ˈlɪtməs/ 名词 C2

中文：石蕊

A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels. (uncountable)
A simple test of acidity in a liquid using litmus, usually in the form of litmus paper. (countable, uncountable)
A simple test of any attribute; a litmus test. (countable, uncountable)

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In his right hand he held a slip of litmus-paper.

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