from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A line connecting places on the Earth's surface that have the same mean frequency of auroras.
from the GNU version of the Collaborative International Dictionary of English
- n. A line connecting places on the earth's surface at which there is the same mean frequency of auroras.
from The Century Dictionary and Cyclopedia
- n. An isochasmic line.
iso- + chasm (Wiktionary)
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