Tropaeolin
Pronunciation : Tro*p?"o*lin
Part of Speech : n.
Definition : Defn: 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 (Trop?olum).
(Chem.)
Source : Webster's Unabridged Dictionary, 1913