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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: chemical) realgar; red sulphide of arsenic.

2. (Science: botany) 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.

Origin: L. Sandaraca, Gr.