The Collaborative International Dictionary
Isocryme
Isocryme \I"so*cryme\, n. [Iso- + Gr. ? cold.] (Phys. Geog.) A line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.
Wiktionary
isocryme
n. A line connecting points on the Earth's surface having the same mean temperature in the coldest month of the year.