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6 definitions found
 for Isatis tinctoria
From The Collaborative International Dictionary of English v.0.48 :

  Indican \In"di*can\, n. [See Indigo.]
     [1913 Webster]
     1. (Chem.) A glucoside ({C14H17NO6) obtained from woad
        (indigo plant, Isatis Tinctoria) and other plants (see
        indigo), as a yellow or light brown sirup. When purified
        it is obtained as spear-shaped crystals. It has a nauseous
        bitter taste. By the action of acids, enzymes, etc., it
        breaks down into sugar and indigo. It is the source of
        natural indigo. Chemically it is the 3-glucoside of
        indole, H-indol-3-yl-[beta]-D-glucopyranoside.
        [1913 Webster +PJC]
     2. (Physiol. Chem.) An indigo-forming substance, found in
        urine, and other animal fluids, and convertible into red
        and blue indigo (urrhodin and uroglaucin). Chemically, it
        is indoxyl sulphate of potash, C8H6NSO4K, and is derived
        from the indol formed in the alimentary canal. Called also
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Indigo \In"di*go\, n.; pl. Indigoes. [F. indigo, Sp. indigo,
     indico, L. indicum indigo, fr. Indicus Indian. See Indian.]
     [1913 Webster]
     1. A kind of deep blue, one of the seven prismatic colors.
        [1913 Webster]
     2. (Chem.) A blue dyestuff obtained from several plants
        belonging to very different genera and orders, such as,
        the woad, Isatis tinctoria (family Cruciferae),
        Indigofera suffroticosa, Indigofera tinctoria (family
        Leguminosae), Indigofera Anil, Nereum tinctorium,
        Polygonum tinctorium Ait. (family Polygonaceae), etc.;
        called also natural indigo. It is a dark blue earthy
        substance, tasteless and odorless, with a copper-violet
        luster when rubbed. Indigo does not exist in the plants as
        such, but is obtained by decomposition of the glycoside
        [1913 Webster]
     Note: Commercial indigo contains the essential coloring
           principle indigo blue or indigotine, with several other
           dyes; as, indigo red, indigo brown, etc., and various
           impurities. Indigo is insoluble in ordinary reagents,
           with the exception of strong sulphuric acid.
           [1913 Webster]
     Chinese indigo (Bot.), Isatis indigotica, a kind of woad.
     Wild indigo (Bot.), the American herb Baptisia tinctoria
        which yields a poor quality of indigo, as do several other
        species of the same genus.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Pastel \Pas"tel\, n. [F.; cf. It. pastello. Cf. Pastil.]
     1. A crayon made of a paste composed of a color ground with
        gum water. [Sometimes incorrectly written pastil.]
        "Charming heads in pastel." --W. Black.
        [1913 Webster]
     2. (Bot.) A plant affording a blue dye; the woad ({Isatis
        tinctoria); also, the dye itself.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Isatis \I"sa*tis\ (?; 277), n. [L., a kind of plant, Gr. ?
     woad.] (Bot.)
     A genus of herbs, some species of which, especially the
     Isatis tinctoria, yield a blue dye similar to indigo; woad.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Woad \Woad\, n. [OE. wod, AS. w[=a]d; akin to D. weede, G. waid,
     OHG. weit, Dan. vaid, veid, Sw. veide, L. vitrum.] [Written
     also wad, and wade.]
     [1913 Webster]
     1. (Bot.) An herbaceous cruciferous plant ({Isatis
        tinctoria) of the family Cruciferae (syn.
        Brassicaceae). It was formerly cultivated for the blue
        coloring matter derived from its leaves. See isatin.
        [1913 Webster]
     2. A blue dyestuff, or coloring matter, consisting of the
        powdered and fermented leaves of the Isatis tinctoria.
        It is now superseded by indigo, but is somewhat used with
        indigo as a ferment in dyeing.
        [1913 Webster]
              Their bodies . . . painted with woad in sundry
              figures.                              --Milton.
        [1913 Webster]
     Wild+woad+(Bot.),+the+weld+({Reseda+luteola">Wild woad (Bot.), the weld ({Reseda luteola). See Weld.
     Woad mill, a mill grinding and preparing woad.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  Isatis tinctoria
      n 1: European biennial formerly grown for the blue coloring
           matter yielded by its leaves [syn: dyer's woad, Isatis

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