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pottern

ˈpottern, a. Obs. rare.
  [f. potter n.1, app. after leathern, etc.]
  Of or pertaining to potters: with quots. cf. potter's lead, ore, potter n.1 3.

1661 Boyle Unsuccessfuln. Experim. i. Wks. 1772 I. 323 An ore, which for its aptness to vitrify, and serve the potters to glaze their earthen vessels, the miners call pottern-ore. a 1728 Woodward Nat. Hist. Fossils (1729) I. i. 188 A Spar..that is shattery, and breaks in Squares, exactly like the finest Pottern-Lead-Ore.

Oxford English Dictionary

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