Definition of ore:

part of speech: noun

Properly the vein of metal- so called from the ore found in a thin band appearing in the section like a vein running through the rock; a metal as extracted from the earth combined with other substances;- as mixed with mineral matters, ores receive the various names of matrix, gangue, vein- stone, or ore- stone.

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In arch., a small round moulding less than an astragal. ...