natural indigo
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 {indican}. [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]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • natural indigo — noun see indigo I …   Useful english dictionary

  • 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… …   The Collaborative International Dictionary of English

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  • indigo — /in di goh /, n., pl. indigos, indigoes, adj. n. 1. a blue dye obtained from various plants, esp. of the genus Indigofera, or manufactured synthetically. 2. See indigo blue (def. 2). 3. any of numerous hairy plants belonging to the genus… …   Universalium

  • indigo — noun (plural gos or goes) Etymology: Italian dialect, from Latin indicum, from Greek indikon, from neuter of indikos Indic, from Indos India Date: 1555 1. a. a blue vat dye obtained from plants (as indigo plants) b. the principal coloring matter… …   New Collegiate Dictionary

  • indigo — A blue dyestuff obtained from Indigofera tinctoria, and other species of Indigofera (family Leguminosae); also made synthetically. SYN: i. blue, indigotin. [L. indicum, fr. G. indikon, i., ntr. of Indikos, Indian] * * * in·di·go in di .gō n, pl… …   Medical dictionary

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