litmus
noun/ˈlɪtməs/
/ˈlɪtməs/
[uncountable]- a substance that turns red when it touches an acid and blue when it touches an alkali
- litmus paper
Oxford Collocations DictionaryLitmus is used before these nouns:- paper
Word OriginMiddle English: from Old Norse lit-mosi, from litr ‘dye’ + mosi ‘moss’.Definitions on the go
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litmus