isopectic

[ ahy-suh-pek-tik ]
/ ˌaɪ səˈpɛk tɪk /

noun

a line drawn on a map connecting all points where ice starts to form at approximately the same period at the onset of winter.

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weal

Origin of isopectic

iso- + -pectic < Greek pēktikós freezing; see pectic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020