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isochasm

[ahy-suh-kaz-uh m] /ˈaɪ səˌkæz əm/
noun, Meteorology
1.
a line on a map or chart connecting points where auroras are observed with equal frequency.
Origin of isochasm
1880-1885
1880-85; iso- + chasm
Related forms
isochasmic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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