Bottom pillar | Article about bottom pillar by The Free Dictionary
bottom pillar[′bäd·əm ‚pil·ər]
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.
References in periodicals archive
The Seven Pillars of a New Filipino are divided into four Bottom Pillars
and three Upper Pillars.