noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   A line drawn on a map or chart connecting places of equal or constant pressure.
2. 2
   (meteorology)an isogram connecting points having equal barometric pressure at a given time wordnet
3. 3
   A set of points or conditions at constant pressure.
4. 4
   Either of two nuclides of different elements having the same mass number.

Synonyms

All synonyms

air massanticycloneartificial isotopeatomcold frontcold sector

Etymology

From Ancient Greek ἴσος (ísos, “equal”) + βάρος (báros, “weight”), equivalent to iso- + bar-.

Related phrases

mass number

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.