Webster's 1828 Dictionary
ARSENIOUS
a.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.
Webster's 1913 Dictionary
ARSENIOUS
Ar *se "ni *ous, a. Etym: [Cf. F. arsénieux.]
1. Pertaining to, consisting of, or containing, arsenic; as, arsenious powder or glass.
2. (Chem. )
Defn: Pertaining to, or derived from, arsenic, when having an equivalence next lower than the highest; as, arsenious acid.
New American Oxford Dictionary
arsenious
arsenious |ɑːˈsiːnɪəs | ▶adjective Chemistry of arsenic with a valency of three; of arsenic (III ). Compare with arsenic.
Oxford Dictionary
arsenious
arsenious |ɑːˈsiːnɪəs | ▶adjective Chemistry of arsenic with a valency of three; of arsenic (III ). Compare with arsenic.
The Wordsmith Dictionary