1. Chem.an emerald-green, poisonous, water-insoluble powder produced from arsenic trioxide and copper acetate: used chiefly as a pigment, insecticide, and wood preservative.
2. (sometimes l.c.) a variable hue ranging from light to vivid yellow green in color.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.