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isodynamic line[¦ī·sō·dī′nam·ik ′līn]
One of the lines on a map of a magnetic field that connect points having equal strengths of the earth's field.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A line joining points of equal magnetic field intensity.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved