Meaning of litmus in English:


Pronunciation /ˈlɪtməs/

Translate litmus into Spanish


mass noun
  • A dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.

    ‘In the presence of a basic solution, litmus will lose hydronium ions and turn blue.’
    • ‘During the 1660s, Robert Boyle discovered that certain plant extracts, such as litmus, can be used to distinguish acids from bases.’


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