isobar

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈaɪsəʊˌbɑː/US:USA pronunciation: respellingUSA pronunciation: respellingsə bär′)


WordReference Random House Unabridged Dictionary of American English © 2025
i•so•bar  sə bär′),USA pronunciation n. 
  1. Meteorologya line drawn on a weather map or chart that connects points at which the barometric pressure is the same.
Also, i•so•bare  sə bâr′).USA pronunciation [Physics, Chem.]one of two or more atoms having equal atomic weights but different atomic numbers. Cf. isotope.
  • Greek isobaré̄s of equal weight. See iso-, baro-
  • 1860–65
iso•bar′ism, n. 

Collins Concise English Dictionary © HarperCollins Publishers::
isobar / ˈaɪsəʊˌbɑː/
  1. a line on a map connecting places of equal atmospheric pressure, usually reduced to sea level for purposes of comparison, at a given time or period
  2. any of two or more atoms that have the same mass number but different atomic numbers
    Compare isotope
Etymology: 19th Century: from Greek isobarēs of equal weight, from iso- + baros weightˈisobarˌism
'isobar' also found in these entries (note: many are not synonyms or translations):

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