va·​line | \ ˈva-ˌlēn How to pronounce valine (audio) , ˈvā- How to pronounce valine (audio) \

Definition of valine

: a crystalline essential amino acid C5H11NO2 that is one of the building blocks of plant and animal proteins

Examples of valine in a Sentence

Recent Examples on the Web 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, "In tracking a lethal family of diseases that threatens humans and animals, scientists have become the hunters," 6 July 2017

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.

First Known Use of valine

1907, in the meaning defined above

History and Etymology for valine

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

Keep scrolling for more

Learn More about valine

Time Traveler for valine

Time Traveler

The first known use of valine was in 1907

See more words from the same year

Statistics for valine

Cite this Entry

“Valine.” Dictionary, Merriam-Webster, Accessed 27 Nov. 2020.

Keep scrolling for more

More Definitions for valine


va·​line | \ ˈvā-ˌlēn How to pronounce valine (audio) , ˈva-ˌlēn How to pronounce valine (audio) \

Medical Definition of valine

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

More from Merriam-Webster on valine Encyclopedia article about valine

Comments on valine

What made you want to look up valine? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

A Thanksgiving Word Quiz

  • a traditional thanksgiving dinner
  • November comes from a word for which of the following numbers?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!