Pronunciation: [ˈɑːsənɪəs] (IPA) 
The spelling of the word arsenious can be a bit confusing due to its pronunciation. The word is pronounced /ɑːˈsiːniəs/ with the stress on the second syllable. The 'arsen' part comes from the Latin word for arsenic, 'arsenicum', and the 'ous' at the end indicates that it is an adjective. While the spelling may differ from how it is pronounced, understanding the origins of the word can help in remembering its spelling.
Arsenious, also known as arsenious oxide or arsenic trioxide, is a white crystalline compound composed of arsenic and oxygen, with the chemical formula As2O3. It is one of the principal forms of arsenic, a toxic element found in the Earth's crust.
In terms of its physical properties, arsenious is a solid substance that is odorless and tasteless. It is highly soluble in water, and when dissolved it forms arsenic acid or arsenite ions, depending on the pH of the solution. It is commonly used in the production of various chemicals, pigments, and glass.
From a health and safety perspective, arsenious has long been recognized as a potent poison. It is classified as a human carcinogen and can cause severe health problems if ingested or inhaled. Exposure to this compound can lead to acute symptoms such as abdominal pain, vomiting, diarrhea, and in some cases, even death. Chronic exposure may result in long-term health consequences, including damage to the liver, kidneys, lungs, and cardiovascular system.
Due to its toxicity, the use of arsenious compounds has significantly declined over time, particularly in consumer products. However, its historical significance in various industries and its potential regulatory implications continue to make arsenious an important subject of study and concern for occupational health and safety practitioners.
Arsenous.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The word "arsenious" is derived from the Latin word "arsenicum", which originated from the Greek word "arsenikon". In Greek, "arsenikon" referred to a yellow orpiment pigment that was used in ancient times. It is believed to have been derived from the Persian word "zarnikh" or "zarni". Over time, "arsenikon" was adapted into various languages, ultimately evolving into "arsenious" in English.
