bottom pillar

bottom pillar

[′bäd·əm ‚pil·ər]
(mining engineering)
A large block of solid coal left unworked around the shaft.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The Seven Pillars of a New Filipino are divided into four Bottom Pillars and three Upper Pillars.