from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A line on a weather map connecting points of equal atmospheric pressure.
  • noun Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.

from The Century Dictionary.

  • noun In thermodynamics, a line or curve determined by the equation of state (pv = RT) of a system when p has any constant value; a line of equal pressures.
  • noun In physical geography, a line connecting places on the surface of the globe at which the barometric pressure is the same.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Phys. Geog.) A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun meteorology A line drawn on a map or chart connecting places of equal or constant pressure.
  • noun nuclear physics Either of two nuclides of different elements having the same mass number.
  • noun thermodynamics A set of points or conditions at constant pressure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (meteorology)an isogram connecting points having equal barometric pressure at a given time


from The American Heritage® Dictionary of the English Language, 4th Edition

[iso– + Greek baros, weight; see gwerə- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἴσος (isos, "equal") + βάρος (baros, "weight")



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