Pronunciation: (ī'su-bär"), [key]
1. Meteorol.a line drawn on a weather map or chart that connects points at which the barometric pressure is the same.
2. Also,i•so•barePronunciation: (ī'su-bâr"). [key] Physics, Chem.one of two or more atoms having equal atomic weights but different atomic numbers. Cf. isotope.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.