[ lahy-seen, -sin ]
/ ˈlaɪ sin, -sɪn /

noun Biochemistry.

a crystalline, basic, amino acid, H2N(CH2)4CH(NH2)COOH, produced chiefly from many proteins by hydrolysis, essential in the nutrition of humans and animals. Abbreviation: Lys; Symbol: K

Origin of lysine

First recorded in 1890–95; lys- + -ine2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for lysine

British Dictionary definitions for lysine

/ (ˈlaɪsiːn, -sɪn) /


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

Medicine definitions for lysine

[ līsēn′, -sĭn ]


An essential amino acid derived from the hydrolysis of proteins and required by the body for optimum growth.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for lysine

[ līsēn′ ]

An essential amino acid. Chemical formula: C6H14N2O2. See more at amino acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.