isabnormal

noun
is·​abnormal | \ ¦īs also ¦īz+\
variants: or isoabnormal \ ¦ī(ˌ)sō also -​)zō+ \

Definition of isabnormal

: an imaginary line or a line on a chart that connects or marks places on the surface of the earth having equal differences in a given time from the normal temperature of these places or that indicates differences between the calculated and actual temperatures of the different parallels of latitude

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History and Etymology for isabnormal

is- + abnormal, adjective

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