a. A solid block or rib of coal, etc., left unworked between two collieries or mines for security against accidents arising from an influx of water. See also: barrier; pillar; barrier pillar. Zern
b. Any large pillar entirely or relatively unbroken by roadways or airways that is left around a property to protect it against water and squeezes from adjacent property, or to protect the latter property in a similar manner. Zern
c. Incorrectly used for a similar pillar left to protect a roadway or airway, or group of roadways or airways, or a panel of rooms from a squeeze. Zern
Source: Dictionary of Mining, Mineral, and Related Terms












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