Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old Norse
Origin: litmosi, from litr 'coloring substance' + mosi 'moss'

litmus

 noun
     
Related topics: Chemistry
lit‧mus [uncountable]
HC a chemical that turns red when it touches acid, and blue when it touches an alkali
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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