Paris green

noun

Par·​is green ˈper-əs- 

ˈpa-rəs-

1

: a very poisonous green copper and arsenic compound C₄H₆As₆Cu₄O₁₆ used especially formerly as an insecticide and pigment

2

: a brilliant yellowish green

Word History

Etymology

Paris, France

First Known Use

1845, in the meaning defined at sense 1

Medical Definition

Paris green

noun

Par·​is green ˌpar-əs- 

: a very poisonous copper-based bright green powder Cu(C₂H₃O₂)₂·3Cu(AsO₂)₂ that is used as an insecticide and pigment