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).
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.