noun
1. usually capitalized P : an insecticide and pigment prepared as a very poisonous bright green powder (as from arsenic trioxide and copper acetate) and consisting of copper acetoarsenite approximately Cu(C 2 H 3 O 2 ) 2 .3Cu(AsO 2 ) 2 — called also emerald green, Schweinfurt green
2. often capitalized P
a. : a variable color averaging a brilliant yellowish green
b. : a moderate yellowish green that is greener, lighter, and stronger than tarragon, lighter and slightly stronger than malachite green, and yellower, lighter, and stronger than verdigris — called also imperial green