isoleucine

American

[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. Ile; I

isoleucine British

/ -sɪn, ˌaɪsəʊˈluːsiːn /

noun

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

isoleucine Scientific

/ ī′sə-lo̅o̅′sēn′ /

An essential amino acid. Chemical formula: C ₆ H ₁₃ NO ₂ .
See more at amino acid

Etymology

Origin of isoleucine

First recorded in 1900–05; iso- + leucine

Compare meaning

How does isoleucine compare to similar and commonly confused words? Explore the most common comparisons:

isoleucine vs. leucine

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

isoleucine

Methionine, isoleucine, and valine appear to play especially important roles.

From Science Daily ● Aug. 2, 2026

While the results are promising, humans do need isoleucine to live.

From Science Daily ● Nov. 22, 2023

The Survey of the Health of Wisconsin showed that people vary in isoleucine intake, with leaner participants tending to eat a diet lower in isoleucine.

From Science Daily ● Nov. 22, 2023

The mice on the low-isoleucine diets chowed down, eating significantly more calories than their study counterparts -- probably to try to make up for getting less isoleucine, according to Lamming.

From Science Daily ● Nov. 22, 2023

They are known as essential amino acids, and in humans they include isoleucine, leucine, and cysteine.

From Textbooks ● Jun. 9, 2022

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023