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1. (n.) litmus
a blue coloring matter obtained from certain lichens, esp. Roccella tinctoria, that turns blue in alkaline solution and red in acid solution: widely used as a chemical indicator.
Etymology: (1495–1505; earlier lytmos < ON litmosi dye-moss =lit- color, dye +mosi moss)
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| Definition of 'litmus' |
Princeton's WordNet |
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1. (noun) litmus, litmus test
a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
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| Definition of 'litmus' |
Webster Dictionary |
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1. (noun) litmus
a dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein
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| Definitions of 'litmus' |
The Nuttall Encyclopedia |
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1. litmus
a colouring matter obtained from certain lichens; extensively used in chemical experiments to detect acids, for instance.
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Definitions of litmus 
