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From: Webster's Revised Unabridged Dictionary (1913)

 Tro·pae·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 (Tropaeolum).
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