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litmus

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Litmus \Lit"mus\, noun [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.

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.

{Litmus paper} (Chem.), unsized paper saturated with blue or red litmus, -- used in testing for acids or alkalies.

From WordNet (r) 3.0 (2006) [wn]:

litmus

noun

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 [syn: {litmus}, {litmus test}]


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Thursday, March 5, 2015 6:31:35 AM Coordinated Universal Time (UTC)

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