EXAMPLES | WORD ORIGIN noun . Meteorology a line drawn on a weather map or chart that connects points at which the barometric pressure is the same. Also i·so·bare . [ ahy-s uh-bair] /ˈaɪ səˌbɛər/ . Physics, Chemistry one of two or more atoms having equal atomic weights but different atomic numbers. Origin of isobar 1860–65;
“of equal weight,” from
Related forms i·so·bar·ism, noun
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for isobars isobar Examples from the Web for isobars Historical Examples of isobars British Dictionary definitions for isobars noun 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 physics any of two or more atoms that have the same mass number but different atomic numbers tin-115 and indium-115 are isobars Compare isotope Derived Forms isobarism, noun Word Origin for isobar
C19: from Greek
isobarēs of equal weight, from iso- + baros weight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for isobars n.
1864, coined from Greek
isos "equal" (see iso-) + baros "weight," from barys "heavy" (see grave (adj.)). Line connecting places with the same barometric pressure at the same time.
Online Etymology Dictionary, © 2010 Douglas Harper
n. Any of two or more kinds of atoms having the same atomic mass but different atomic numbers. A line on a weather map connecting points of equal atmospheric pressure.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
A line drawn on a weather map connecting places having the same atmospheric pressure. The distance between isobars indicates the barometric gradient (the degree of change in atmospheric pressure) across the region shown on the map. When the lines are close together, a strong pressure gradient is indicated, creating conditions for strong winds. When the lines are far apart, a weak pressure gradient is indicated and calm weather is forecast.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.