va·​line ˈva-ˌlēn How to pronounce valine (audio) ˈvā- How to pronounce valine (audio)
: a crystalline essential amino acid C5H11NO2 that is one of the building blocks of plant and animal proteins

Example Sentences

Recent Examples on the Web Leucine, like valine and isoleucine, is a branched-chain amino acid. Dr. Keith Roach, oregonlive, 28 Nov. 2022 Branched-chain amino acids (BCAAs) are a class of three important amino acids known as leucine, isoleucine, and valine. Amber Smith, Discover Magazine, 22 Dec. 2022 Every scoop of Plant JYM Vegan Protein Powder contains 24 grams of protein and five grams of leucine, isoleucine and valine, stacked at the recommend 2:1:1 ratio. Dallas News, 15 Feb. 2022 These essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenyalinine, threonine, tryptophan and valine. Alyssa Jung, Good Housekeeping, 5 Oct. 2021 Pineapples contain valine and leucine, two amino acids that are essential to human health. Katy Severson,, 26 Feb. 2021 At the 129th position in the chain, there are three possible combinations involving two different amino acids, methionine and valine. Mark Johnson, Milwaukee Journal Sentinel, 6 July 2017 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'valine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History


borrowed from German Valin, from Valeriansäure valeric acid + -in -ine entry 2

First Known Use

1907, in the meaning defined above

Time Traveler
The first known use of valine was in 1907

Dictionary Entries Near valine

Cite this Entry

“Valine.” Dictionary, Merriam-Webster, Accessed 27 Mar. 2023.

Medical Definition


: a crystalline essential amino acid C5H11NO2 that occurs especially in fibrous proteins
abbreviation Val

More from Merriam-Webster on valine

Last Updated: - Updated example sentences
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