from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a dye, related to litmus, that is extracted from the lichen Rocella tinctoria; used as a microscopic stain and as a food colouring

from the GNU version of the Collaborative International Dictionary of English

  • n. A reddish brown amorphous dyestuff, C7H7NO3, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus.

from The Century Dictionary and Cyclopedia

  • n. A nitrogenous compound (C7H7NO3) formed from orcine and ammonia.


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