Tropaeolin /(?)/

Tro·pae·o·lin

Tropaeolin

n.
  1. 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 (Tropaeolum). (Chem.)