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Having four columns; such as a tetrastyle portico, which has four columns in front.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
Having four columns in the front or end row; consisting of a row or rows of four columns.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.