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isopor

[ahy-suh-pawr] /ˈaɪ səˌpɔr/
noun
1.
an imaginary line on the earth's surface connecting points of equal annual change in the declination, inclination, or other components of the earth's magnetic field.
Also called isoporic line.
Origin
1930-1935
1930-35; iso- + -por < Greek póros path, pore2
Related forms
isoporic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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