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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
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
Nglish: Translation of amino acid for Spanish Speakers
Britannica.com: Encyclopedia article about amino acid
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