from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A highly poisonous metallic element having three allotropic forms, yellow, black, and gray, of which the brittle, crystalline gray is the most common. Arsenic and its compounds are used in insecticides, weed killers, solid-state doping agents, and various alloys. Atomic number 33; atomic weight 74.922; valence 3, 5. Gray arsenic melts at 817°C (at 28 atm pressure), sublimes at 613°C, and has a specific gravity of 5.73. See Table at element.
- n. Arsenic trioxide.
- adj. Of or containing arsenic, especially with valence 5.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A nonmetallic chemical element (symbol As) with an atomic number of 33.
- n. Arsenic trioxide.
- adj. Of, or containing arsenic with a valence of 5.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the elements, a solid substance resembling a metal in its physical properties, but in its chemical relations ranking with the nonmetals. It is of a steel-gray color and brilliant luster, though usually dull from tarnish. It is very brittle, and sublimes at 356° Fahrenheit. It is sometimes found native, but usually combined with silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and realgar are two of its sulphur compounds, the first of which is the true arsenicum of the ancients. The element and its compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight 75. Symbol As.
- n. Arsenious oxide or arsenious anhydride; -- called also arsenious acid, white arsenic, and ratsbane.
- adj. Pertaining to, or derived from, arsenic; -- said of those compounds of arsenic in which this element has its highest equivalence.
from The Century Dictionary and Cyclopedia
- n. A yellow mineral, called specifically yellow arsenic; the trisulphid of the element to which it has given its name; orpiment.
- n. Chemical symbol, As; atomic weight, 75. A chemical element having a grayish-white color, a metallic luster, and a specific gravity of 5.727.
- n. The popular name of arsenic trioxid (As2O3), the preparation of arsenic usually retailed in trade. See above.
- Containing arsenic; specifically, containing arsenic in smaller proportion than arsenious compounds. See arsenious.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
- n. a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
Middle English arsenik, from Old French, from Latin arsenicum, from Greek arsenikon, yellow orpiment, alteration of Syriac zarnīkā, from Middle Persian *zarnīk, from Old Iranian *zarna-, golden; see ghel-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English arsenik, from Middle French arsenic, from Latin arsenicum, from Ancient Greek ἀρσενικόν (arsenikón, "yellow arsenic") (influenced by ἀρσενικός (arsenikós, "potent, virile")), from Semitic (compare Logudorese Sardinian ܙܐܦܢܝܐ (zarnīqā)), from Middle Persian *zarnīk (compare Persian زرنی (zarnī, "arsenic")), from Avestan zaranya ("gold"), from zari ("yellow") (compare Persian زر (zar)), from Proto-Indo-European *ǵʰelh₃i. More at yellow. (Wiktionary)