ser·​ine ˈser-ˌēn How to pronounce serine (audio)
: a crystalline nonessential amino acid C3H7NO3 that occurs as a residue in many proteins

Keep scrolling for more

Example Sentences

Recent Examples on the Web Looking at the ingredient list, serine and biotin appear towards the beginning, meaning the formula has it in higher concentrations. Jihan Forbes, Allure, 31 Jan. 2022 This insertion added the peptide GLTSKRN (glycine-leucine-threonine-serine-lysine-arginine-asparagine) between Spike protein positions 214 and 215. William A. Haseltine, Forbes, 28 Sep. 2021 One changes the amino acid at position 202 from serine to asparagine. William A. Haseltine, Forbes, 16 Sep. 2021 That meant serine would still be incorporated into the correct spots of Syn61’s growing proteins. Robert F. Service, Science | AAAS, 3 June 2021 Six codons, for example, code for the amino acid serine. Robert F. Service, Science | AAAS, 3 June 2021 Although the researchers knew that this individuality resulted both from how tightly each cell regulated tumbling and from its response to L-serine, quantifying this variation in specific cells was more challenging. Quanta Magazine, 4 Sep. 2019 The curling formula not only locks your lashes into place for up to 12 hours, but also packs a nourishing dose of pro-vitamin B5 and serine for conditioning benefits. Braelyn Wood,, 10 Oct. 2019 See More

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

Keep scrolling for more

Word History


International Scientific Vocabulary sericin + -ine entry 2

First Known Use

1880, in the meaning defined above

Time Traveler
The first known use of serine was in 1880

Dictionary Entries Near serine

Cite this Entry

“Serine.” Dictionary, Merriam-Webster, Accessed 24 Sep. 2022.

Keep scrolling for more

Keep scrolling for more

Medical Definition



ser·​ine ˈse(ə)r-ˌēn How to pronounce serine (audio)
: a nonessential amino acid C3H7NO3 that occurs especially as a structural part of many proteins and phosphatidylethanolamines and is a precursor of glycine
abbreviation Ser

More from Merriam-Webster on serine

Love words? Need even more definitions?

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

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.