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touchum

touchum [ME touch] 1 black quartz used to prove precious metal, touchstone. 1369 mandamus quod ‥ predicta vasa et zonas ‥ per ~um nostrum ‥ assaiari faciatis (Cl) Foed. VI 611b. 2 iron rod used to ignite gunpowder charge, ‘touch’. 1388 pro xxiiij patellis de ferro pro igne custodiendo pro canonibus inflammandis ‥ et pro iiijxx ~is de ferro (KR Ac) EHR XXVI 698; 1399 de ‥ iiij gonnis de cupro et ferro, vij ~is pro eisdem (AcWardr) Ib. XXVI 701.

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