Dictionary entry

Tropæolin

Webster's Dictionary 1913

Tro‐pæ″o‐lin (?), n.(Chem.) 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).