01 n. Realgar; red sulphide of arsenic.
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1.
Realgar; red sulphide of arsenic.(Min.) [Archaic]
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2.
A white or yellow resin obtained from a Barbary tree (Callitris quadrivalvis or Thuya articulata), and pulverized for pounce; -- probably so called from a resemblance to the mineral.(Bot. Chem.)