单词 | arsenic |
释义 | Word Frequency arsenicnoun (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 adjective (ɑːˈsɛnɪk) 3. of or containing arsenic, esp in the pentavalent state Word origin C14: from Latin arsenicum, from Greek arsenikon yellow orpiment, from Syriac zarnīg (influenced in form by Greek arsenikos virile) |
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