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Isobar

Definition: A line connecting or marking places upon the surface of the
earth where height of the barometer reduced to sea level is the same
either at a given time, or for a certain period (mean height), as for a
year; an isopiestic line.

Isobar

Definition: The quality or state of being equal in weight, especially
in atmospheric pressure. Also, the theory, method, or application of
isobaric science.