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From The Collaborative International Dictionary of English v.0.48:
Ore \Ore\, n. [AS. [=o]ra; cf. [=a]r brass, bronze, akin to OHG. [=e]r, G. ehern brazen, Icel. eir brass, Goth. ais, L. aes, Skr. ayas iron. [root]210. Cf. Ora, Era.] [1913 Webster] 1. The native form of a metal, whether free and uncombined, as gold, copper, etc., or combined, as iron, lead, etc. Usually the ores contain the metals combined with oxygen, sulphur, arsenic, etc. (called mineralizers). [1913 Webster] 2. (Mining) A native metal or its compound with the rock in which it occurs, after it has been picked over to throw out what is worthless. [1913 Webster] 3. Metal; as, the liquid ore. [R.] --Milton. [1913 Webster] Ore hearth, a low furnace in which rich lead ore is reduced; -- also called Scotch hearth. --Raymond. [1913 Webster]