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1. A soft orange-red arsenic ore, As2S2, used in pyrotechnics and tanning and as a pigment.
from The American Heritage® Dictionary of the English Language, 4th Edition
1. A mineral, arsenic sulfide (ass), often associated with orpiment and stibnite in lead, silver and gold ores.
from Wiktionary, Creative Commons Attribution/Share-Alike License
1. arsenic sulphide, a mineral of a brilliant red color; red orpiment. it is also an artificial product.
from the GNU version of the Collaborative International Dictionary of English
1. arsenic disulphid (As2S2), a combination of an equal number of sulphur and arsenic atoms; red sulphuret of arsenic, which is found native in transparent crystals, and also massive.
from The Century Dictionary and Cyclopedia
1. a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.