arsenite
noun
ar·se·nite ˈär-sə-ˌnīt 
: a salt or ester of an arsenious acid
Example Sentences
Recent Examples on the Web Scheele’s Green – was achieved through use of copper arsenite. 
Rosalind Jana, refinery29.com, 28 Jan. 2020 Inorganic compounds such as copper arsenite, also called Scheele’s green, lent a coveted hue to some wallpapers and paints. Erin Blakemore, Washington Post, 19 May 2018
Rosalind Jana, refinery29.com, 28 Jan. 2020 Inorganic compounds such as copper arsenite, also called Scheele’s green, lent a coveted hue to some wallpapers and paints. Erin Blakemore, Washington Post, 19 May 2018 Word History
Etymology
borrowed from French arsénite, from arsenic arsenic entry 1 + -ite -ite entry 2
First Known Use
1796, in the meaning defined above
Medical Definition
arsenite
noun
ar·se·nite ˈär-sə-ˌnīt
: a salt or ester of an arsenious acid