I'so-crȳme, n.
n. [Gr. ἴσος, equal, and κρύμος, cold.] (Phys. Geog.) An imaginary line on the earth's surface, passing through points having the same mean temperature in the coldest month of the year.
n. [Gr. ἴσος, equal, and κρύμος, cold.] (Phys. Geog.) An imaginary line on the earth's surface, passing through points having the same mean temperature in the coldest month of the year.