1
: a solid chemical element that is used especially in wood preservatives, alloys, and semiconductors and is extremely toxic in both pure and combined forms see Chemical Elements Table
2
: a poisonous trioxide As2O3 or As4O6 of arsenic used especially as an insecticide or weed killer
called also arsenic trioxide
ar·sen·ic
är-ˈse-nik
: of, relating to, or containing arsenic especially with a valence of five
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Merriam-Webster unabridged
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