from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A soft orange-red arsenic ore, As2S2, used in pyrotechnics and tanning and as a pigment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.
from the GNU version of the Collaborative International Dictionary of English
- n. Arsenic sulphide, a mineral of a brilliant red color; red orpiment. It is also an artificial product.
from The Century Dictionary and Cyclopedia
- n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic
Middle English, from Medieval Latin, from Catalan, from Arabic rahj al-ġār, powder (of) the mine or cave : rahj, powder + al-, the + ġār, cave; see ġrr in Semitic roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
Old English, from Medieval Latin, from Arabic رهج الغار (rahj-al-ğār, "cave dust"). (Wiktionary)