realgar
[ree-al-ger, -gahr]
- arsenic disulfide, As2S2, found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics.
Show More
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
Historical Examples
Note: Realgar: The Chinese believe that realgar is a mithridate and tonic.
The Chinese Fairy BookVarious
To the unctuous juices belong these species: sulphur, bitumen, realgar and orpiment.
De Re MetallicaGeorgius Agricola
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 VicinityCharles 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 ProteinsHugh Garner Bennett
realgar
- 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
Show More
Word Origin
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