n.
Pronunciation: ' ī -s ə - ˌ bär
Function: noun
Etymology: International Scientific Vocabulary is- + -bar (fr. Greek baros weight); akin to Greek barys heavy ― more at GRIEVE
Date: circa 1864
1 : an imaginary line or a line on a map or chart connecting or marking places of equal barometric pressure
2 : one of two or more atoms or elements having the same atomic weights or mass numbers but different atomic numbers
isobar 1