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The Collaborative International Dictionary
Arsenious

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.

Wiktionary
arsenious

a. of, or containing arsenic with a valence of 3.

WordNet
arsenious

adj. relating to compounds in which arsenic is trivalent

Usage examples of "arsenious".

The salts of silver, mercury, gold, copper, nickel, and platinum, chromic and arsenious acids, cause great inflection with extreme quickness, and are deadly poisons.

By taking hold of the water present, it may prevent the dissociation of arsenious chloride.

The hydrogen decomposes arsenious acid, and forms arseniuretted hydrogen.

A piece of glass or porcelain held to the flame will have, if arsenic be present, a deposit on it having the following characters: In the centre a deposit of metallic arsenic, round this a mixture of metallic arsenic and arsenious acid, and outside this another ring of arsenious acid in octahedral crystals.

If this foil be dried, cut up, put in a reduction-tube, and heated, crystals of arsenious trioxide will be deposited on the cold part of the tube.

Ammonia, salts of, their action affected by previous immersion in water and various solutions, 213 , , induce aggregation in Drosera, 43 , various salts of, causing inflection in Drosera, 166 Antimony, tartrate, action on Drosera, 185 Areolar tissue, its digestion by Drosera, 102 Arsenious acid, action on Drosera, 185 Atropine, action on Drosera, 204 B.

I notice, by the way, that it is ordinary white arsenious acid, without any mixture of charcoal or indigo, which agrees with what was found at the postmortem.