[ˈʌɪsə(ʊ)bɑː], (Noun)

Definitions:
- a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period

- each of two or more isotopes of different elements, with the same atomic weight


Phrases:

Origin:
mid 19th century: from Greek isobaros ‘of equal weight’, from isos ‘equal’ + baros ‘weight’