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isabnormal

[ahy-sab-nawr-muh l] /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.
Also, isoabnormal.
Compare isanomal.
Origin
1850-1855
1850-55; is- + abnormal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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