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A line on a weather map connecting places having equal changes in atmospheric pressure within a given period of time.

[is(o)- + allo- + Greek baros, weight; see gwerə- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physical Geography) meteorol a line on a map running through places experiencing equal pressure changes
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(aɪˈsæl əˌbɑr)

a line on a weather map or chart connecting points having equal pressure changes.
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