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[ahy-suh-loo-seen, -sin] /ˌaɪ səˈlu sin, -sɪn/
noun, Biochemistry
a crystalline amino acid, C 6 H 13 O 2 , occurring in proteins, that is essential to the nutrition of humans and animals. Symbol: I.
Abbreviation: Ile;
Origin of isoleucine
1900-05; iso- + leucine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for isoleucine
  • The proteins of barnacle glue, they discovered, are dominated by amino acids called proline and isoleucine.
British Dictionary definitions for isoleucine


/ˌaɪsəʊˈluːsiːn; -sɪn/
an essential amino acid that occurs in proteins and is formed by protein hydrolysis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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isoleucine in Medicine

isoleucine i·so·leu·cine (ī'sə-lōō'sēn')
Abbr. Ile
An essential amino acid that is isomeric with leucine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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isoleucine in Science
An essential amino acid. Chemical formula: C6H13NO2. See more at amino acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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