realgar(redirected from Arsenic disulfide)
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A soft orange-red arsenic ore, As2S2, used in pyrotechnics and tanning and as a pigment.
[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, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Minerals) a rare orange-red soft mineral consisting of arsenic sulphide in monoclinic crystalline form. It occurs in Utah and Romania and as a deposit from hot springs. It is an important ore of arsenic and is also used as a pigment. Formula: AsS
[C14: via Medieval Latin from Arabic rahj al-ghar powder of the mine]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
re•al•gar(riˈæl gər, -gɑr)
an orange-red mineral, arsenic sulfide, AsS, found in granular and crusty masses and also produced artificially for use in pyrotechnics.
[1350–1400; Middle English < Medieval Latin realger « Arabic rahj al-ghār powder of the mine or cave]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||realgar - a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic|
As, atomic number 33, arsenic - 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
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
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