arsenous

[ ahr-suh-nuhs ]

adjective

, Chemistry.

1. containing arsenic in the trivalent state, as arsenous chloride, AsCl 3 .
2. of or derived from arsenous acid.

Word History and Origins

Origin of arsenous¹

First recorded in 1790–1800; arsen- + -ous

Example Sentences

More recently, all three seem to have voted to halt Trump-appointed Judge Matthew Kacsmaryk’s arsenous decision nullifying FDA approval of the abortion pill.

From Slate

It is, therefore, in this and the analogous processes of roasting, that the sulphurous and arsenous vapours are so profusely given off.

From Project Gutenberg

The most effective treatment that the writer has ever used is the following formula recommended by Dr. Law: Arsenous acid one dram, sulfate of iron five drams, powdered areca nut two ounces, common salt four ounces.

From Project Gutenberg