isabnormal

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

noun Meteorology.

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

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Origin of isabnormal

First recorded in 1850–55; is- + abnormal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020