Hypertext Webster Gateway: "orpiment"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Orpiment \Or"pi*ment\, n. [F., fr. L. auripigmentum; aurum gold
+ pigmentum pigment. Cf. {Aureate}, {Pigment}, {Orpin},
{Orpine}.] (Chem.)
Arsenic sesquisulphide, produced artificially as an amorphous
lemonyellow powder, and occurring naturally as a yellow
crystalline mineral; -- formerly called auripigment. It is
used in king's yellow, in white Indian fire, and in certain
technical processes, as indigo printing.
Our orpiment and sublimed mercurie. --Chaucer.
{Red orpiment}, realgar; the red sulphide of arsenic.
{Yellow orpiment}, king's yellow.
From WordNet (r) 1.7 (wn)
orpiment
n : a yellow mineral occuring in conjunction with realgar; an
ore of arsenic
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