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[lahy-seen, -sin] /ˈlaɪ sin, -sɪn/
noun, Biochemistry.
a crystalline, basic, amino acid, H 2 N(CH 2) 4 CH(NH 2)COOH, produced chiefly from many proteins by hydrolysis, essential in the nutrition of humans and animals. Symbol: K.
Abbreviation: Lys;
Origin of lysine
First recorded in 1890-95; lys- + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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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
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lysine in Medicine

lysine ly·sine (lī'sēn', -sĭn)
Abbr. Lys
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.
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lysine in Science
An essential amino acid. Chemical formula: C6H14N2O2. See more at amino acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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