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Hasil cari dari kata atau frase: Roccella tinctoria (0.01237 detik)
Found 2 items, similar to Roccella tinctoria.
English → English (WordNet) Definition: Roccella tinctoria Roccella tinctoria n : a source of the dye archil and of litmus [syn: roccella]
English → English (gcide) Definition: 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] 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 tinctoria, etc.), and other lichens, and extracted as a white crystalline substance C17H32O4. [1913 Webster] 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 Verd Islands, etc. --Tomlinson. [1913 Webster] 2. The plant from which the dye is obtained. [Written also orchal and orchil.] [1913 Webster]

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