LITMUS


Meaning of LITMUS in English

/ ˈlɪtməs; NAmE / noun

[ U ] a substance that turns red when it touches an acid and blue when it touches an alkali :

litmus paper

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WORD ORIGIN

Middle English : from Old Norse lit-mosi , from litr dye + mosi moss.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.