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isochasm

American  
[ahy-suh-kaz-uhm] / ˈaɪ səˌkæz əm /

noun

Meteorology.

  1. a line on a map or chart connecting points where auroras are observed with equal frequency.

Other Word Forms

  • isochasmic adjective

Etymology

Origin of isochasm

First recorded in 1880–85; iso- + chasm

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.