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isodynamic line

Scientific  
/ ī′sō-dī-năm′ĭk /

  1. A line on a map connecting points on the Earth where the strength of the Earth's magnetic field is the same.

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.