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litmus 音标拼音: [l'ɪtməs]

n. 石蕊

石蕊

WordNet (r) 3.0 (2006) (WordNet)

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}]

The Collaborative International Dictionary of English v.0.48 (gcide)

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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