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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

TAA specifies lysine, while TAG specifies glutamic acid.

From Science Daily ● May 7, 2026

Plants use an amino acid called lysine for many things, including as a part of their detection and response to pests.

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

Beans have both lysine and tryptophan, but not the amino acids cysteine and methionine, which are provided by maize.

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