Meaning of pyrazolone dye

pyraz'olone dye'

Pronunciation: [key]
— Chem. Chem.
  1. any of the group of dyes, as tartrazine, derived from a pyrazolone: used chiefly to dye silk and wool.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.