Obs. rare–1. [Corruption of dial. German darndel = darrling, f. darr-en to dry, parch, roast.] Silver or copper ore which remains unreduced in smelting.
1683. Pettus, Fleta Min., I. xxvii. § 9. 75. Let the Silver be dry, and when the Thornels (if there be any) and the Silver hath taken hold on the Ashes, they must be beaten down with a Hammer. Ibid., II. 125. Thornels,… a term of Art, for that which remains of the roasted Oar, unmelted.
