SG Heritage Dictionary

Arsenious [Adjective] Webster's Dictionary 1828

Pertaining to, or containing arsenic. The arsenious acid, or white oxyd of arsenic, is a combination of arsenic with a less proportion of oxygen than in the arseniac acid.

Arsenious [Adjective] Webster's Dictionary 1913

1. Pertaining to, consisting of, or containing, arsenic; as, arsenious powder or glass.

2. Pertaining to, or derived from, arsenic, when having an equivalence next lower than the highest; as, arsenious acid.