agonic line

an imaginary line on the surface of the earth connecting all points at which the declination of the magnetic field of the earth is zero.

1860–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
agonic line
an imaginary line on the surface of the earth connecting points of zero magnetic declination

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
agonic line   (ā-gŏn'ĭk)  Pronunciation Key 
An imaginary line on the Earth's surface connecting points where the magnetic declination is zero. The agonic line is a line of longitude on which a compass will show true north, since where magnetic declination is zero, magnetic north coincides with geographic north.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When the two poles align, declination is zero, and the line of zero declination is termed the agonic line.
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