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单词 litmus
释义 litmus
 /lit"meuhs/,  n.  
 a blue coloring matter obtained from certain lichens, esp. Roccella tinctoria. In alkaline solution litmus turns blue, in acid solution, red: widely used as a chemical indicator.
 [1495-1505; earlier lytmos < ON litmosi dye-moss, equiv. to lit- color, dye + mosi moss]
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