[ahy-suh-loo-seen, -sin]
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. Abbreviation: Ile; Symbol: I

1900–05; iso- + leucine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isoleucine (ˌaɪsəʊˈluːsiːn, -sɪn)
an essential amino acid that occurs in proteins and is formed by protein hydrolysis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
isoleucine   (ī'sə-l'sēn')  Pronunciation Key 
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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Example sentences
The proteins of barnacle glue, they discovered, are dominated by amino acids called proline and isoleucine.
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