Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A substance resembling indigo blue, obtained artificially from certain isatogen compounds.

from the GNU version of the Collaborative International Dictionary of English

  • n. A substance resembling indigo blue, obtained artificially from certain isatogen compounds.

from The Century Dictionary and Cyclopedia

  • n. A blue flocculent precipitate obtained when propiolic acid in sulphuric-acid solution is treated with reducing agents such as metallic iron, zinc, or copper. It differs from indigo in not easily yielding a sulphonic acid on heating.

Etymologies

-in (Wiktionary)

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