Definition of litmus noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈlɪtməs//
; NAmE NAmE//ˈlɪtməs//
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a substance that turns red when it touches an acid and blue when it touches an alkali litmus paper Word OriginMiddle English: from Old Norse lit-mosi, from litr ‘dye’ + mosi ‘moss’.
See the Oxford Advanced American Dictionary entry: litmus

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