realgar
Americannoun
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arsenic disulfide, As 2 S 2 , found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics.
noun
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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
Etymology
Origin of realgar
1350–1400; Middle English < Medieval Latin realger ≪ Arabic rahj al-ghār powder of the mine or cave
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
I stuck my head inside a cabinet to get a close look at the rocks of the arsenic sulfides realgar and orpiment, blazes of flame orange locked within the crystals.
From The New Yorker • Aug. 27, 2018
There is also a flux which separates sulphur, orpiment and realgar from metalliferous ore.
From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius
Combined with sulphur it forms orpiment and realgar, which are the yellow and red sulphides of arsenic.
From The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli by Various
Orpiment and realgar are the yellow and red arsenical sulphides.
From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius
It is very widely distributed, being sometimes found native, and sometimes combined, as AsS, realgar, As2S8, orpiment, and FeAsS, arsenopyrite.
From An Introduction to Chemical Science by Williams, Rufus Phillips
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.