colcothar
Crocus Cro"cus (kr[=o]"k[u^]s), n. [L., saffron, fr. Gr. kro`kos; cf. Heb. kark[=o]m, Ar. kurkum, Skr. ku[.n]kuma.] 1. (Bot.) A genus of iridaceous plants, with pretty blossoms rising separately from the bulb or corm. {Crocus vernus} is one of the earliest of spring-blooming flowers; {Crocus sativus} produces the saffron, and blossoms in the autumn. [1913 Webster]

2. (Chem.) A deep yellow powder; the oxide of some metal calcined to a red or deep yellow color; esp., the oxide of iron ({Crocus of Mars} or {colcothar}) thus produced from salts of iron, and used as a polishing powder. [1913 Webster]

{Crocus of Venus} (Old Chem.), oxide of copper. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Colcothar — Col co*thar (k[o^]l k[ o]*th[ e]r), n. [NL. colcothar vitrioli, fr. Ar. qolqo[.t]ar.] (Chem.) Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; called also {crocus Martis}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Colcothar — (Colcothar vitrioli), von Theophr. Paracelsus eingeführtes Wort, bes. das rothe Eisenoxyd, welches nach der Austreibung der Schwefelsäure aus Eisenvitriol bei Bereitung der rauchenden od. nordhäuser Schwefelsäure zurückbleibt, heißt, nochmals… …   Pierer's Universal-Lexikon

  • Colcothar — Colcothar, s. Eisenrot …   Lexikon der gesamten Technik

  • Colcothar — Colcothar, der Rückstand des Eisenvitriols nach seiner Destillation zu Schwefelsäure …   Herders Conversations-Lexikon

  • colcothar — [käl′kō thər, käl′kəthər] n. [Sp colcotar < Ar qulqutār < Gr chalkanthos, solution of blue vitriol (copper sulfate) < chalkos, copper + anthos, flower] a brownish red oxide of iron, obtained by heating ferrous sulfate: it is used as a… …   English World dictionary

  • colcothar — ⇒COLCOT(H)AR, (COLCOTAR, COLCOTHAR)subst. masc. CHIM. Oxyde ferrique de couleur rouge obtenu artificiellement par calcination du sulfate de fer dont il constitue le résidu, utilisé pour le polissage du verre et des métaux, ainsi que dans la… …   Encyclopédie Universelle

  • colcothar — geležies(III) oksidas statusas T sritis chemija formulė Fe₂O₃ atitikmenys: angl. colcothar; ferric oxide; iron minium; iron sesquioxide; ironic oxide; iron(III) oxide; Prussian red; red iron oxide; red ocher, US; red ochre, GB; Spanish oxide rus …   Chemijos terminų aiškinamasis žodynas

  • colcothar — /kol keuh theuhr/, n. Chem. the brownish red oxide of iron produced by heating ferrous sulfate: used chiefly as a pigment in paints and theatrical rouge, and as a polishing agent. Also called jewelers rouge. [1595 1605; < ML < OSp colcotar, SpAr… …   Universalium

  • colcothar — col·co·thar …   English syllables

  • colcothar — /ˈkɒlkəθa/ (say kolkuhthah) noun the red oxide of iron, Fe2O3, which remains after heating ferrous sulphate, and is used as a pigment and polishing agent; rouge. {Medieval Latin, from Arabic qolqotār} …   Australian English dictionary

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