arsenic trioxide
noun
ar·se·nic trioxide
| \ ˌärs-nik-, -ᵊn-ik-
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Medical Definition of arsenic trioxide
: a poisonous trioxide of arsenic As2O3 or As4O6 that is administered intravenously to treat some forms of leukemia and in minute doses is used as a homeopathic remedy
Note: Arsenic trioxide is typically obtained as a by-product from the roasting of arsenic-containing ores and is used especially as a rodenticide and weed killer.
— called also arsenic, arsenious acid, arsenious oxide, white arsenic