Ī'so-bār'/o-mēt'rie, a.

a. [Gr. ἴσος, equal, βάρος, weight, and μέτρον, measure.] (Phys. Geog.) Indicating equal barometric pressure; denoting lines on the surface of the globe connecting places that present the same mean barometrical pressure, as determined by means of the monthly extremes of the barometer. Nichol.