Definition of Rocce. Meaning of Rocce. Synonyms of Rocce
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Definition of Rocce
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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.
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.
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.
Litmus paper (Chem.), unsized paper saturated with blue or
red litmus, -- used in testing for acids or alkalies.
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 tinctoria, etc.), and
other lichens, and extracted as a white crystalline substance
C17H32O4.
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 Verd Islands, etc. --Tomlinson.
2. The plant from which the dye is obtained. [Written also
orchal and orchil.]
Roccellic 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.
Roccellin Roccellin Roc*cel"lin, n.
A red dyestuff, used as a substitute for cochineal, archil,
etc. It consists of the sodium salt of a complex azo
derivative of naphtol.
