variant of iso- before a vowel: isallobar. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combining form
variant of iso- : isentropic

iso- or (before a vowel) is-
combining form
1.  equal or identical: isomagnetic
2.  indicating that a chemical compound is an isomer of a specified compound: isobutane; isocyanic acid
[from Greek isos equal]
is- or (before a vowel) is-
combining form
[from Greek isos equal]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

is- pref.
Variant of iso-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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