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Marked by or indicating equal pressure; isobaric.
[iso- + Greek piestos, able to be compressed (from piezein, to press tight; see sed- in Indo-European roots) + -ic.]
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) a line on a map connecting places with equal ground water pressure
[C19: from iso- + Greek piestos compressible, from piezein to press]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014