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Definition of Isochasm
1. n. A line connecting places on the earth's surface at which there is the same mean frequency of auroras.
Definition of Isochasm
1. Noun. (geography) A line connecting places on the Earth's surface that have the same mean frequency of auroras. ¹
¹ Source: wiktionary.com
Definition of Isochasm
1. a contour line showing auroral displays [n -S]
Medical Definition of Isochasm
1.