is-

is-

variant of iso- before a vowel: isallobar.
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Collins
World English Dictionary
is-
 
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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