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isopor

American  
[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.

Other Word Forms

  • isoporic adjective

Etymology

Origin of isopor

1930–35; iso- + -por < Greek póros path, pore 2

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.