- 1. n. A line connecting places on the earth's surface at which there is the same mean frequency of auroras. Source: opted
- 2. A line connecting places on the earth's surface at which there is the same mean frequency of auroras. Source: webster
- 3. A line connecting places on the earth's surface at which thereis the same mean frequency of auroras. Source: adambom
- 4. n. A line connecting places on the earth's surface at which there is the same mean frequency of auroras. Source: ecdict
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isochasm
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