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Isatis tinctoria definitions

WordNet (r) 3.0 (2005)

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

Webster's 1913 Dictionary

2. (Chem.) A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. 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 indican. 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. 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.

Webster's 1913 Dictionary

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.

Webster's 1913 Dictionary

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.] 1. (Bot.) An herbaceous cruciferous plant (Isatis tinctoria). It was formerly cultivated for the blue coloring matter derived from its leaves. 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 It is now superseded by indigo, but is somewhat used with indigo as a ferment in dyeing. Their bodies . . . painted with woad in sundry figures. --Milton. Wild woad (Bot.), the weld (Reseda luteola). See Weld. Woad mill, a mill grinding and preparing woad.

Webster's 1913 Dictionary

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. 2. (Bot.) A plant affording a blue dye; the woad (Isatis tinctoria); also, the dye itself.



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