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isopor

[ahy-suh-pawr]
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.
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Origin of isopor

1930–35; iso- + -por < Greek póros path, pore2
Also called isoporic line.
Related formsi·so·por·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018