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litmus 音标拼音: [l'ɪtməs] n. 石蕊 石蕊 litmus n 1: 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 [ synonym: { litmus}, { litmus test}] Litmus \ Lit" mus\, n. [ D. lakmoes; lak lacker moes a thick preparation of fruit, pap, prob. akin to E. meat: cf. G. lackmus. See { Lac} a resinous substance.] ( Chem.) 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. [ 1913 Webster] Note: Litmus is used as a dye, and being turned red by acids and restored to its blue color by alkalies, is a common indicator or test for acidity and alkalinity. [ 1913 Webster] { Litmus paper} ( Chem.), unsized paper saturated with blue or red litmus, -- used in testing for acids or alkalies. [ 1913 Webster]
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