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litigator | litiginous | litigious | litigiously | litigiousness | litmus | litmus paper | litmus test | litocranius | litocranius walleri | litoral





litmusn. [D. lakmoes; lak lacker + moes a thick preparation of fruit, pap, prob. akin to E. meat: cf. G. lackmus. See Lac a resinous substance.].
     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]
    " 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.


litmus, n. a dye obtained from lichens that is red under acid conditions and blue under alkaline conditions.

litmus paper a paper stained with litmus to be used as a test for acids or alkalis.
ME f. ONorw. litmosi f. ON litr dye + mosi moss

For further exploring for "litmus" in Webster Dictionary Online

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