isobar Meaning, Definition & Usage

  1. noun (meteorology)an isogram connecting points having equal barometric pressure at a given time

WordNet

I"so*bar noun
Etymology
Iso- + Gr. weight.
Definitions
  1. (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. Written also isobare.
I"so*bar noun
Definitions
  1. The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science.

Webster 1913