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litmus	<chemistry> 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 colouring matters related to orcin and orcein. Litmus is used as a dye, and being turned red by acids and restored to its blue colour by alkalies, is a common indicator or test for acidity and alkalinity. <chemistry> Litmus paper, unsized paper saturated with blue or red litmus, used in testing for acids or alkalies. Origin: D. Lakmoes; lak lacker + moes a thick preparation of fruit, pap, prob. Akin to E. Meat: cf. G. Lackmus. See Lac a resinous substance. Source: Websters Dictionary (01 Mar 1998)

litmus

<chemistry> 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 colouring matters related to orcin and orcein.
Litmus is used as a dye, and being turned red by acids and restored to its blue colour by alkalies, is a common indicator or test for acidity and alkalinity.
<chemistry> Litmus paper, unsized paper saturated with blue or red litmus, used in testing for acids or alkalies.
Origin: D. Lakmoes; lak lacker + moes a thick preparation of fruit, pap, prob. Akin to E. Meat: cf. G. Lackmus. See Lac a resinous substance.
Source: Websters Dictionary
(01 Mar 1998)