noun ar·se·nic \ˈärs-nik, ˈär-sə-\

: a poisonous chemical that is used especially to kill insects and weeds

Full Definition of ARSENIC

:  a trivalent and pentavalent metalloid poisonous element that is commonly metallic steel gray, crystalline, and brittle and is used especially in wood preservatives, alloys, and semiconductors — see element table
:  a poisonous trioxide As2O3 or As4O6 of arsenic used especially as an insecticide or weed killer —called also arsenic trioxide

Origin of ARSENIC

Middle English arsenik orpiment, from Anglo-French & Latin; Anglo-French, from Latin arsenicum, from Greek arsenikon, arrhenikon, from Syriac zarnīg, of Iranian origin; akin to Avestan zaranya gold, Sanskrit hari yellowish — more at yellow
First Known Use: 14th century


adjective ar·sen·ic \är-ˈse-nik\

Definition of ARSENIC

:  of, relating to, or containing arsenic especially with a valence of five

First Known Use of ARSENIC

ARSENIC Defined for Kids


noun ar·se·nic \ˈärs-nik, ˈär-sə-\

Definition of ARSENIC for Kids

:  a solid poisonous chemical element that is usually gray and snaps easily
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