[awr, ohr]
a metal-bearing mineral or rock, or a native metal, that can be mined at a profit.
a mineral or natural product serving as a source of some nonmetallic substance, as sulfur.

before 900; conflation of Middle English ore, Old English ōra ore, unreduced metal; and Middle English or(e) ore, metal, Old English ār brass, cognate with Old Saxon, Old High German ēr, Old Norse eir, Gothic aiz; compare Latin aes bronze, coin, money

oar, o'er, or, ore.
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noun, plural öre.
a bronze coin of Norway, the 100th part of a krone.
a zinc or bronze coin of Denmark, the 100th part of a krone.
a bronze coin of Sweden, the 100th part of a krona.
a fractional currency of the Faeroe Islands, the 100th part of a krona.
Also, øre [œ-ruh] , (for defs 1, 2).

1600–10;Latin aureus a gold coin

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ore (ɔː)
any naturally occurring mineral or aggregate of minerals from which economically important constituents, esp metals, can be extracted
[Old English ār, ōra; related to Gothic aiz, Latin aes, Dutch oer]

öre (ˈørə)
n , pl öre
a Scandinavian monetary unit worth one hundredth of a Swedish krona and (øre) one hundredth of a Danish and Norwegian krone

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

12c., merger of O.E. ora "ore, unworked metal" (related to ear "earth"); and O.E. ar "brass, copper, bronze," from P.Gmc. *ajiz- (cf. O.N. eir "brass, copper," Ger. ehern "brazen," Goth. aiz "bronze"), from PIE *aus- "gold" (cf. Skt. ayah "metal," Avestan ayo, L. aes "brass"). The two words were not
fully assimilated till 17c.; what emerged has the form of ar but the meaning of ora.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ore   (ôr)  Pronunciation Key 
A naturally occurring mineral or rock from which a valuable or useful substance, especially a metal, can be extracted at a reasonable cost.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

ore definition

In geology, a mineral that contains a commercially useful material, such as gold or uranium.

Note: Ore deposits are generally mined, and the ore is processed to recover the material.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
And newer deposits tend to mix gold with other ores, so diversification will
Furthermore, cyanide is not used in aluminum processing, and of course being
  short-lived and volatile is not present in any ores.
These are well known processes but currently they are concentrated near where
  the ores are originally mined.
In this decade, high-grade uranium ores will deplete significantly, leaving the
  industry to resort to low-grade ores.
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