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Related to datum line: datum point
datum line[′dad·əm ‚līn]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Any line which can serve as a reference or base for the measurement of other quantities.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
A baseline, or reference line, from which calculations or measurements are taken. See datum.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved