Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various blue dyes, used to sensitize photographic emulsions to a greater range of light.

from The Century Dictionary.

  • noun In chem., a beautiful blue dye, chinoline blue, prepared by acting on a mixture of chinoline and lepidine with amyl iodide. Unfortunately it does not resist the action of light, and hence has lost its importance as a dyestuff, but, it is used in making orthochromatic plates for photography.
  • noun The blue coloring matter of certain flowers, as the corn-flower, violet, and species of iris.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) One of a series of artificial blue or red dyes obtained from quinoline and lepidine and used in calico printing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of a family of synthetic blue dyes used in photography etc.

Etymologies

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