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is-

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is-

 
Use is- in a Sentence
var. of iso- before a vowel: isallobar.
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iso-

 
a combining form meaning “equal,” used in the formation of compound words: isochromatic; in chemistry, used in the names of substances which are isomeric with the substance denoted by the base word: isocyanic acid.
Also, especially before a vowel, is-.

Origin:
< Gk, comb. form of ísos equal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To is-
is-  
pref.  Variant of iso-.
iso- or is-  
pref.  

  1. Equal; uniform: isobar.

  2. Isomeric: isopropyl.


[Greek īso-, from īsos, equal.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

is- pref.
Variant of iso-.

iso- or is-
pref.

  1. Equal; uniform: isobar.

  2. Isomeric: isopropyl.

  3. Characterized by sameness with respect to species: isoantigen.

  4. Characterized by sameness with respect to genotype: isograft.

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

  1. A prefix that means "equal," as in isometric, "having equal measurements."

  2. A prefix used to indicate an isomer of an organic compound, especially a branched isomer of a compound that normally consists of a straight chain. The isomer is characterized by a Y-shaped branch at the end of the chain that consists of two "prongs". Each prong consists of one carbon atom. Thus isopentane contains five carbon atoms like normal pentane, but arranged as a chain of three carbons plus a Y-shaped branch of two carbons at the end.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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