isogonic line

noun

: an imaginary line or a line on a map joining points on the earth's surface at which the magnetic declination is the same

called also isogonal

Word History

First Known Use

circa 1859, in the meaning defined above

Time Traveler
The first known use of isogonic line was circa 1859

Dictionary Entries Near isogonic line

Cite this Entry

“Isogonic line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isogonic%20line. Accessed 25 Jun. 2024.

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