arsenous

[ ahr-suh-nuh s ]
/ ˈɑr sə nəs /

adjective Chemistry.

containing arsenic in the trivalent state, as arsenous chloride, AsCl3.
of or derived from arsenous acid.
Also arsenious.

Origin of arsenous

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

Can be confused

arsenous arsonous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019