[ ahy-suh-loo-seen, -sin ]
/ ˌaɪ səˈlu sin, -sɪn /

noun Biochemistry.

a crystalline amino acid, C6H13O2, occurring in proteins, that is essential to the nutrition of humans and animals. Abbreviation: Ile; Symbol: I

Origin of isoleucine

First recorded in 1900–05; iso- + leucine Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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

Medicine definitions for isoleucine

[ ī′sə-lōōsēn′ ]


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.

Science definitions for isoleucine

[ ī′sə-lōōsēn′ ]

An essential amino acid. Chemical formula: C6H13NO2. See more at amino acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.