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单词 litmus
释义

WordReference Random House Learner's Dictionary of American English © 2024
lit•mus /ˈlɪtməs/USA pronunciation   n. [uncountable]
  1. Chemistrycoloring matter that turns blue in alkaline solution and red in acid solution, used as a chemical indicator.

WordReference Random House Unabridged Dictionary of American English © 2024
lit•mus  (lit′məs),USA pronunciation n. 
  1. Chemistrya 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.
  • Old Norse litmosi dye-moss, equivalent. to lit- color, dye + mosi moss
  • earlier lytmos 1495–1505

Collins Concise English Dictionary © HarperCollins Publishers::
litmus /ˈlɪtməs/ n
  1. a soluble powder obtained from certain lichens. It turns red under acid conditions and blue under basic conditions and is used as an indicator
Etymology: 16th Century: perhaps from Scandinavian; compare Old Norse litmosi, from litr dye + mosi moss
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更新时间：2025/7/23 18:25:19