Roccella
Orcin Or"cin, n. [Etymology uncertain: cf. F. orcine.] (Chem.) A colorless crystalline substance, {C6H3.CH3.(OH)2}, which is obtained from certain lichens ({Roccella}, {Lecanora}, etc.), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Roccella — Dec., Flechtengattung aus der Familie der Roccellazeen, mit zylindrischem oder wenig zusammengedrücktem, strauchförmigem Thallus, der ein dichtes, faseriges Mark enthält, und seitenständigen, nicht schildförmigen, sondern im Thallus sitzenden… …   Meyers Großes Konversations-Lexikon

  • Roccella — DC., Flechtengattg. der Strauchflechten, in wärmern Gegenden an Felsen, bes. an Meeresküsten. R. tinctorĭa, DC., (Lackmus , Orseille , Färberflechte [Abb. 1525; a Teil davon]), bes. auf den Kanarischen Inseln, zu Lackmus (s.d.) und Orseille… …   Kleines Konversations-Lexikon

  • Roccella — (Rotsch–), der beste ital. und sicil. Waizen …   Herders Conversations-Lexikon

  • roccella — [ʀɔsɛ(l)la] ou rocelle [ʀɔsɛl] n. f. ÉTYM. 1839, Boiste, rocella; rocelle, 1846; var. sav. du catalan orcella « orseille », due « au fait que l orseille vit de préférence sur les pierres » (Bloch). ❖ ♦ Bot. Genre de lichen tinctorial fournissant… …   Encyclopédie Universelle

  • 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

  • roccella — roc·cèl·la s.f. TS bot. lichene del genere Roccella diffuso sui litorali del Mediterraneo e delle Isole di Capo Verde | con iniz. maiusc., genere della famiglia delle Roccellacee {{line}} {{/line}} DATA: 1822 23. ETIMO: dal lat. scient. Roccella …   Dizionario italiano

  • Roccella — ID 72112 Symbol Key ROCCE Common Name roccella lichen Family Roccellaceae Category Lichen Division Ascomycota US Nativity N/A US/NA Plant Yes State Distribution N/A Growth Habit N/A …   USDA Plant Characteristics

  • roccella — noun Any of a group of lichens of genus Roccella; especially Rocella tinctoria from which litmus is extracted …   Wiktionary

  • Roccella —       genus of tropical fruticose lichen, an important source of the dye orchil and litmus (qq.v.). * * * …   Universalium

  • Roccella — pl.f. roccelle …   Dizionario dei sinonimi e contrari

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