Definition of Litmos
Litmus, a colouring matter obtained from certain lichens;
extensively used in chemical experiments to detect acids, for instance.
- Wikipedia
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.
&fist; 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.
- Webster's Unabridged Dictionary (1913)
- A dyestuff extracted from certain lichens.
- The Nuttall Encyclopedia
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