Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. General name of a number of orange dyes of very complex composition. They are sulphonic acids.

from the GNU version of the Collaborative International Dictionary of English

  • n. A name given to any one of a series of orange-red dyestuffs produced artificially from certain complex sulphonic acid derivatives of azo and diazo hydrocarbons of the aromatic series; -- so called because of the general resemblance to the shades of nasturtium (Tropæolum).

from The Century Dictionary and Cyclopedia

  • n. The general name of a number of orange dyes of very complex composition. They are sulphonic acids.

Etymologies

Tropæolum +‎ -in (Wiktionary)

Examples

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