Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A synthetic red crystalline nitrogenous substance which by reduction passes directly to indigo.

from the GNU version of the Collaborative International Dictionary of English

  • n. A red crystalline nitrogenous substance of artificial production, which by reduction passes directly to indigo.

from The Century Dictionary and Cyclopedia

  • n. A red compound, C16H8O4N2, prepared by the action of sulphuric acid on dinitro-diphenyl-diacetylene. It crystallizes in needles, and is readily converted into indigo by reducing agents.

Etymologies

di- +‎ isatogen (Wiktionary)

Examples

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