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a strip of open land in forest or prairie, to arrest the advance of a fire
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A cleared area of land intended to check the spread of forest or prairie fire.
A strip across an area in which either no combustible material is employed or in which, if timber supports are used, sand is filled and packed tightly around them.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. Space between buildings, groups of buildings, or areas of a city designed to prevent the spread of fire from one building, group, or area to another.
2. Fire-resistive floors, walls, doors, shutters, etc., designed to prevent the spread of fire within a building.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.