01 n. The vertical side of any opening, as a door or fireplace; hence, less properly, any narrow vertical surface of wall, as the of a chimney-br…
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1.
The vertical side of any opening, as a door or fireplace; hence, less properly, any narrow vertical surface of wall, as the of a chimney-breast or of a pier, as distinguished from its face.(Arch)
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2.
Any thick mass of rock which prevents miners from following the lode or vein.(Mining)