51Թ

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isabnormal

[ ahy-sab-nawr-muhl ]

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.


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51Թ History and Origins

Origin of isabnormal1

First recorded in 1850–55; is- + abnormal

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Isabella of Franceisacoustic