| slovo | definícia |
Lecanora tartarea
(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.
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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.
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Litmus paper (Chem.), unsized paper saturated with blue or
red litmus, -- used in testing for acids or alkalies.
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Lecanora tartarea
(gcide) | Cudbear \Cud"bear`\ (k?d"b?r`), n. [Also cudbeard, corrupted
fr. the name of Dr. Cuthbert Gordon, a Scotchman, who first
brought it into notice.]
1. A powder of a violet red color, difficult to moisten with
water, used for making violet or purple dye. It is
prepared from certain species of lichen, especially
Lecanora tartarea. --Ure.
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2. (Bot.) A lichen (Lecanora tartarea), from which the
powder is obtained.
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