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lysine

American

[lahy-seen, -sin] / ˈlaɪ sin, -sɪn /

noun

Biochemistry.

a crystalline, basic, amino acid, H 2 N(CH2 ) 4 CH(NH2 )COOH, produced chiefly from many proteins by hydrolysis, essential in the nutrition of humans and animals. Lys; K

lysine British

/ -sɪn, ˈlaɪsiːn /

noun

an essential amino acid that occurs in proteins

"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

lysine Scientific

/ lī′sēn′ /

An essential amino acid. Chemical formula: C ₆ H ₁₄ N ₂ O ₂ .
See more at amino acid

Etymology

Origin of lysine

First recorded in 1890–95; lys- + -ine ²

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:

lysine

In the study, UAA was found to code for lysine and UAG for glutamic acid.

From Science Daily ● May 7, 2026

One metabolite, or product, of lysine produced during this process is called pipecolic acid, and another, produced at a later step, is called N-hydroxypipecholic acid.

From Salon ● Mar. 5, 2025

The nonsticky, vegan lip treatments are meant to heal lips via shea butter, jojoba oil and lysine.

From Los Angeles Times ● Mar. 14, 2024

ADM was the subject of a nonfiction book titled “The Informant” in 2000, and an ensuing film starring Matt Damon, about a 1990s price-fixing scheme for the the animal feed additive lysine.

From Seattle Times ● Jan. 22, 2024

Maize lacks digestible niacin, the amino acids lysine and tryptophan, necessary to make proteins and diets with too much maize can lead to protein deficiency and pellagra, a disease caused by lack of niacin.

From "1491" by Charles C. Mann

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