[val-een, -in, vey-leen, -lin]
noun Biochemistry.
  1. an essential amino acid, (CH3)2CHCH(NH2)COOH, white, crystalline, and water-soluble, present in most plant and animal proteins, required for growth. Abbreviation: Val; Symbol: V

Origin of valine

First recorded in 1910–15; val(eric) + -ine2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for valine


  1. an essential amino acid; a component of proteins

Word Origin for valine

C19: from val (eric acid) + -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

valine in Medicine


[vălēn′, vālēn′]
  1. An essential amino acid that is a constituent of proteins, especially fibrous proteins.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

valine in Science


  1. An essential amino acid. Chemical formula: C5H11NO2. See more at amino acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.