See also: tropæolin

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Etymology edit

Tropaeolum +‎ -in

Noun edit

tropaeolin (countable and uncountable, plural tropaeolins)

  1. Any of several orange dyes of very complex composition: tropaeolin O (acid orange 6, chrysoine resorcinol), tropaeolin OO (acid orange 5), or tropaeolin OOO (acid orange 7).