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white arsenic


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WordReference Random House Learner's Dictionary of American English © 2026
ar•se•nic /ˈɑrsənɪk/USA pronunciation   n. [uncountable]
  1. Chemistrya grayish white substance, one of the chemical elements, that can be made into a dangerous poison.
  2. Chemistrythe poison made from arsenic.

WordReference Random House Unabridged Dictionary of American English © 2026
ar•se•nic  (n. är′sə nik, ärs′nik;adj. är sen′ik),USA pronunciation n. 
  1. Chemistrya grayish-white element having a metallic luster, vaporizing when heated, and forming poisonous compounds. Symbol: As;
    at. wt.: 74.92;
    at. no.: 33.
  2. ChemistrySee arsenic trioxide. 
  3. Mineralogya mineral, the native element, occurring in white or gray masses.

adj. ar•sen•ic 
  1. Chemistryof or containing arsenic, esp. in the pentavalent state.
  • *arznig, metathetic variant of Syriac zarnig) by folk etymology, etymological
  • Greek arsenikón orpiment, noun, nominal use of neuter of arsenikós virile (ársēn male, strong + -ikos -ic), probably alteration of Oriental word (perh.
  • Latin
  • Middle English arsenicum 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::
arsenic / ˈɑːsnɪk/
  1. a toxic metalloid element, existing in several allotropic forms, that occurs principally in realgar and orpiment and as the free element. It is used in transistors, lead-based alloys, and high-temperature brasses. Symbol: As; atomic no: 33; atomic wt: 74.92159; valency: –3, 0, +3, or +5; relative density: 5.73 (grey); melting pt: 817°C at a pressure of 3MN/m2 (grey); sublimes at 613°C (grey)
  2. a nontechnical name for arsenic trioxide
 / ɑːˈsɛnɪk/
  1. of or containing arsenic, esp in the pentavalent state
Etymology: 14th Century: from Latin arsenicum, from Greek arsenikon yellow orpiment, from Syriac zarnīg (influenced in form by Greek arsenikos virile)

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