Roccella tinctoria
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. [1913 Webster]

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. [1913 Webster]

{Litmus paper} (Chem.), unsized paper saturated with blue or red litmus, -- used in testing for acids or alkalies. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Roccella tinctoria — Roccella tinctoria …   Wikipédia en Français

  • Roccella tinctoria —   Urzela …   Wikipedia Español

  • Roccella tinctoria — Roccella tinctoria …   Wikipédia en Français

  • Roccella tinctoria — Roccellic Roc*cel lic, a. [F. roccellique, fr. roccelle archil, It. & NL. roccella, fr. It. rocca a rock, because archil grows on rock.] (Chem.) Pertaining to, or designating, a dibasic acid of the oxalic series found in archil ({Roccella… …   The Collaborative International Dictionary of English

  • Roccella tinctoria — Archil Ar chil (?; 277), n. [OF. orchel, orcheil, It. orcella, oricello, or OSp. orchillo. Cf. {Orchil}.] 1. A violet dye obtained from several species of lichen ({Roccella tinctoria}, etc.), which grow on maritime rocks in the Canary and Cape… …   The Collaborative International Dictionary of English

  • Roccella tinctoria — ID 72121 Symbol Key ROTI Common Name roccella lichen Family Roccellaceae Category Lichen Division Ascomycota US Nativity Native to U.S. US/NA Plant Yes State Distribution N/A Growth Habit Lichenous …   USDA Plant Characteristics

  • Roccella tinctoria — noun a source of the dye archil and of litmus • Syn: ↑roccella • Hypernyms: ↑lichen • Member Holonyms: ↑genus Roccella …   Useful english dictionary

  • Roccella tinctoria DC. — Symbol ROTI Common Name roccella lichen Botanical Family Roccellaceae …   Scientific plant list

  • Roccella canariensis — Roccella tinctoria …   Wikipédia en Français

  • roccella — noun a source of the dye archil and of litmus • Syn: ↑Roccella tinctoria • Hypernyms: ↑lichen • Member Holonyms: ↑genus Roccella * * * Roccella /rok selˈə/ noun A genus of lichens, yielding archil and litmus ORIGIN: It …   Useful english dictionary

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