- arsenic disulfide, As2S2, found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics.
Origin of realgar
1350–1400; Middle English < Medieval Latin realger ≪ Arabic rahj al-ghār powder of the mine or cave
Also called red orpiment.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for realgar
Note: Realgar: The Chinese believe that realgar is a mithridate and tonic.The Chinese Fairy Book
To the unctuous juices belong these species: sulphur, bitumen, realgar and orpiment.De Re Metallica
In former times, orpiment, like realgar, was employed in medicine.
A mounting medium of the highest refractive index, such as realgar, is required to resolve the stri.The Diatomaceae of Philadelphia and Vicinity
Charles Sumner Boyer
An alternative to the above process is to hasten the earlier part of the liming by employing sodium sulphide instead of realgar.Animal Proteins
Hugh Garner Bennett
- 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 & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012