[ al-uh-neen, -nin ]
/ ˈæl əˌnin, -nɪn /

noun Biochemistry.

any of several isomers of a colorless, crystalline, water-soluble amino acid, CH3CH(NH2)COOH, found in many proteins and produced synthetically: used chiefly in biochemical research. Abbreviation: Ala; Symbol: A

Origin of alanine

1860–65; al(dehyde) + -an- (arbitrarily inserted) + -ine2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for alanine


/ (ˈæləˌniːn, -ˌnaɪn) /


a nonessential aliphatic amino acid that occurs in many proteins

Word Origin for alanine

C19: from German Alanin, from al (dehyde) + -an- (euphonic infix) + -in -ine ²
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 alanine


[ ălə-nēn′ ]


A crystalline amino acid that is a constituent of many proteins.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for alanine


[ ălə-nēn′ ]

A nonessential amino acid. Chemical formula: C3H7NO2. See more at amino acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.