agonic line

noun
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.

Origin:
1860–65

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World English Dictionary
agonic line
 
n
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.
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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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