realgar

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re·al·gar

 (rē-ăl′gär′, -gər)
n.
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.]

realgar

(rɪˈælɡə)
n
(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]

re•al•gar

(riˈæl gər, -gɑr)

n.
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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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