Isobar n. (Written also isobare) (Phys. Geog.) 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.
... been variable, with cryptoconchoidal deflections of a solid reverberating isobar previously tested in a solution of zinc and soda-water. This indicates cold weather ... — Punch, or the London Charivari, Vol. 99, July 19, 1890 • Various
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