Definition of "arsenious" [ar•se•ni•ous]

• Of or containing arsenic, especially with valence 3. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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