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