Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of isochasm is as below...

Isochasm :: Isochasm (n.) A line connecting places on the earth's surface at which there is the same mean frequency of auroras.

Isochasmic :: Isochasmic (a.) Indicating equal auroral display; as, an isochasmic line..

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