Hypertext Webster Gateway: "arsenious"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Arsenious \Ar*se"ni*ous\, a. [Cf. F. ars['e]nieux.]
1. Pertaining to, consisting of, or containing, arsenic; as,
arsenious powder or glass.
2. (Chem.) Pertaining to, or derived from, arsenic, when
having an equivalence next lower than the highest; as,
arsenious acid.
From WordNet (r) 1.7 (wn)
arsenious
adj : relating to compounds in which arsenic is trivalent
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