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isotac

American  
[ahy-suh-tak] / ˈaɪ səˌtæk /

noun

  1. a line drawn on a map connecting all points where ice starts to melt at approximately the same period in spring.

Etymology

Origin of isotac

iso- + -tac < Greek takênai to melt or takerós melting

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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