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arsenic(As)
(ahr-senŽik)
a chemical element, atomic number 33, atomic weight 74.92. It is toxic by inhalation or ingestion, and carcinogenic (see arsenic poisoning). In nature it occurs usually as one of its salts; in human environments it is often a pollutant in mining regions, and is
used in dyes, household pesticides, and compounds used in agriculture. Arsenic compounds called arsenicals were formerly widely used in medicine.
arsenic trioxide
an oxidized form of arsenic, used in weed killers and rodenticides. It is also administered intravenously as an antineoplastic in the treatment of acute promyelocytic leukemia.

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