arsenic
//ˈɑːr.sə.nɪk//
Noun
1
A chemical element (symbol As, atomic number 33) that is a brittle, steel-gray metalloid, highly toxic and used in alloys, semiconductors, and pesticides.
Arsenic is a highly toxic element that was once used in pesticides.
2
A poisonous compound of arsenic, especially arsenic trioxide, historically used as a poison.
In the 19th century, arsenic was commonly used as a poison because it was difficult to detect.
Adjective
arsenicCanonical form
1
Of, relating to, or containing arsenic, especially with a valence of five.
Arsenic acid is formed when arsenic compounds react with oxygen.