Толковый словарь английского языка - arsenic
Arsenic
arsenic
I. noun see: yellow Date: 14th century 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, a poisonous trioxide As2O3 or As4O6 of ~ used especially as an insecticide or weed killer, II. adjective Date: 1801 of, relating to, or containing ~ especially with a valence of five
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1.
n. & adj. --n. 1 a non-scientific name for arsenic trioxide, a highly poisonous white powdery substance used in weed-killers, rat poison, etc. 2 Chem. a brittle semi-metallic element, used in semiconductors and alloys. Usage Symb.: As. --adj. 1 of or concerning arsenic. 2 Chem. containing arsenic with a valency of five. Phrases and idioms red arsenic = REALGAR. white arsenic = sense 1. Derivatives arsenious adj. Etymology: ME f. OF f. L arsenicum f. Gk arsenikon yellow orpiment, identified with arsenikos male, but in fact f. Arab. al-zarnik f. al the + zarnik orpiment f. Pers. f. zar gold ...Толковый словарь английского языка Oxford English Reference
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