amino acid

noun

: an amphoteric organic acid containing the amino group NH2
especially : any of the various amino acids having the amino group in the alpha position that are the chief components of proteins and are synthesized by living cells or are obtained as essential components of the diet

Examples of amino acid in a Sentence

Recent Examples on the Web The rice in question is fermented with a particular yeast that yields less alcohol and more key nutrients, like amino acids, for skin. Deanna Pai, Vogue, 13 Mar. 2024 Organic Max Fiber Protein Powder Hemp seed has a complete amino acid profile, deeming this a great pick to include in a balanced diet. April Benshosan, Glamour, 13 Mar. 2024 However, a recent study published in the journal Nutrition suggests that the amino acid taurine could serve as a beneficial dietary supplement to potentially postpone the onset of aging. Daphne Ewing-Chow, Forbes, 29 Feb. 2024 While ingredients may vary depending on the mask’s purpose, a mask with strengthening ingredients like biotin and amino acids can be an excellent place to start. Jessie Quinn, Peoplemag, 13 Feb. 2024 Black tea also contains the amino acid l-theanine, though other teas contain higher amounts of it. Clare Mulroy, USA TODAY, 5 Jan. 2024 Matcha boasts a boost of antioxidants and the amino acid L-Theanine, which is thought to promote relaxation and jitter-free, sustained energy. Kate Kassin, Bon Appétit, 26 Feb. 2024 It’s formulated with hyaluronic acid for hydration, marshmallow root sustainably sourced from Albania to deliver antioxidants and violet rice water rich in B vitamins and amino acids. Celia Shatzman, Forbes, 26 Feb. 2024 When combined with other molecules, HCN can help form nucleobases and amino acids, the precursors to more complex biochemistry such as proteins and RNA. Ling Xin, Scientific American, 14 Dec. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'amino acid.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1897, in the meaning defined above

Time Traveler
The first known use of amino acid was in 1897

Dictionary Entries Near amino acid

Cite this Entry

“Amino acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/amino%20acid. Accessed 28 Mar. 2024.

Kids Definition

amino acid

noun
ami·​no acid
ə-ˈmē-nō-
: any of numerous acids that include some which are the building blocks of proteins and are made by living cells from simpler compounds or are obtained in the diet

Medical Definition

amino acid

noun
: an amphoteric organic acid containing the amino group NH2
especially : alpha-amino acid

More from Merriam-Webster on amino acid

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