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From The Collaborative International Dictionary of English v.0.48:
Pounce \Pounce\, n. [F. ponce pumice, pounce, fr. L. pumex, -icis, pumice. See Pumice.] 1. A fine powder, as of sandarac, or cuttlefish bone, -- formerly used to prevent ink from spreading on manuscript. [1913 Webster] 2. Charcoal dust, or some other colored powder for making patterns through perforated designs, -- used by embroiderers, lace makers, etc. [1913 Webster] Pounce box, a box for sprinkling pounce. Pounce paper, a transparent paper for tracing. [1913 Webster]