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isabnormal

American  
[ahy-sab-nawr-muhl] / ˌaɪ sæbˈnɔr məl /

noun

Meteorology.

  1. a line on a map or chart connecting points having an equal deviation from the normal value of some meteorological quantity, as temperature.

Etymology

Origin of isabnormal

First recorded in 1850–55; is- + abnormal

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.