realgar

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“
These are orpiment, realgar, acetic acid, artificial camphor, per-iodide of tin, and the chlorides of tin and arsenic.

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Definitions (4)

Toggle American Heritage definitions American Heritage Dictionary (1)

  1. noun A soft orange-red arsenic ore, As2S2, used in pyrotechnics and tanning and as a pigment.

Toggle Century definitions Century Dictionary (1)

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Examples (23)

  • Other common minerals are realgar (As 2 S 2 ); orpiment (As 2 S 3 ); and arsenic trioxide (As 2 O 3 ); occasionally the pure element is found in nature. —  Poisons
  • In 850, the Chinese alchemist who discovered gunpowder by accident, instead of adding honey to his concoction of sulfur, realgar and saltpetre, added animal dung, and subsequently discovered explosives. —  Elections - fresh news by plazoo.com
  • These are orpiment, realgar, acetic acid, artificial camphor, per-iodide of tin, and the chlorides of tin and arsenic. —  Experimental Researches in Electricity, Volume 1
  • GOLD COLOUR This is procured by mixing massicot, or Naples yellow, with a small quantity of realgar, and a very little Spanish white 281. —  Young's Demonstrative Translation of Scientific Secrets
  • The meaning of the passage is obscure 1081 The Germans are wont to annoy a garrison with the smoke of feathers, sulphur and realgar, and they make this smoke last 7 or 8 hours. —  The Notebooks of Leonardo Da Vinci — Complete
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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. 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.

Toggle Century etymologies Century Dictionary (1)

  1. Also resalgar, from Middle English resalgar, rysalgar, rosalgar; =Old French realgal, reagal, riagal, realgal, risigal, French réalgar =Spanish rejalgar =Portuguese rosalgar =Italian risigallo (Middle Latin risigallum), from Arabic rahj al-ghar, realgar, literally ‘powder of the mine,’ mineral powder (so called because derived orig. from silver-mines): rahj, rehj, dust, powder; al, the; ghār (gār), cavern, mine. Cf. Arabic rahj asfar, orpiment.
 

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/rəˈælgər/
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