from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Relating to or containing arsenic, especially with valence 3.

from The Century Dictionary.

  • Pertaining to or containing arsenic.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Pertaining to, consisting of, or containing, arsenic.
  • adjective (Chem.) Pertaining to, or derived from, arsenic, when having an equivalence next lower than the highest.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective relating to compounds in which arsenic is trivalent


Sorry, no etymologies found.


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  • Facetious and abstemious contain all the vowels in the correct order, as does arsenious, meaning “containing arsenic.”

    10 Weird Science Facts You Didn’t Know 2006

  • In 1904, I showed that arsenious acid (in the form of sodium arsenite) produced excellent effects in infections due to Tr. gambiense; and in 1904 and 1905, I communicated several notes to the Academy of Sciences on the combined treatment of various trypanosomiases by arsenious acid and Trypan red.

    Alphonse Laveran - Nobel Lecture 1967

  • The results which we obtained by combining atoxyl with arsenic trisulphide or arsenious iodide have been very satisfactory and we hope that this new drug treatment may be used in human trypanosomiasis or sleeping sickness which is raging at the present time among the natives of Equatorial Africa and of which there are more and more cases among Europeans.

    Alphonse Laveran - Nobel Lecture 1967

  • I undertook new experiments aimed at investigating whether the combination of two different arsenical preparations would not give better results than the use of arsenious acid alone or atoxyl alone.

    Alphonse Laveran - Nobel Lecture 1967

  • The arsenites give the reactions of arsenious acid.

    Aids to Forensic Medicine and Toxicology

  • The hydrogen decomposes arsenious acid, and forms arseniuretted hydrogen.

    Aids to Forensic Medicine and Toxicology

  • From the acids in insoluble and a few other compounds, chromic, arsenic, and arsenious acids, by fusion with carbonate of soda in presence of carbonic acid gas; borate of manganese is readily decomposed when the boracic acid is to be determined by boiling with solution of potassa, dissolving the residue in hydrochloric acid and precipitating the manganese as binoxide.

    Scientific American Supplement, No. 324, March 18, 1882 Various

  • Fowler's solution is the best-known medicinal preparation of arsenic, and contains 1 grain of arsenious anhydride in 110 minims.

    Aids to Forensic Medicine and Toxicology

  • 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.

    Aids to Forensic Medicine and Toxicology

  • 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.

    Aids to Forensic Medicine and Toxicology


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  • One of those nice euvocalic words whose vowels are in alphabetical order.

    December 29, 2010