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
Ounce for ounce, turkey contains less tryptophan—an amino acid popularly blamed for post-Thanksgiving sleepiness—than cheddar cheese or an octopus does.
—
The Atlantic Science Desk, The Atlantic, 27 Dec. 2025
Powered by the brand’s signature TFC8 complex, which has amino acids, vitamins, and lipids, the formula supports skin renewal and helps improve elasticity over time—key concerns when skin starts to look crepey or lose firmness.
—Deanna Pai, Glamour, 27 Dec. 2025
The drinks are also formulated with essential vitamins and L-theanine, an amino acid found in green and black teas that has been studied for its effects on anxiety, cognition and sleep, as described by Verywell Health.
—Moná Thomas, PEOPLE, 26 Dec. 2025
It’s also made with a strengthening blend of amino acids and violet pigments.
—Jenny Berg, Vogue, 26 Dec. 2025
See All Example Sentences for amino acid
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The Atlantic Science Desk, The Atlantic, 27 Dec. 2025
Powered by the brand’s signature TFC8 complex, which has amino acids, vitamins, and lipids, the formula supports skin renewal and helps improve elasticity over time—key concerns when skin starts to look crepey or lose firmness.
—Deanna Pai, Glamour, 27 Dec. 2025
The drinks are also formulated with essential vitamins and L-theanine, an amino acid found in green and black teas that has been studied for its effects on anxiety, cognition and sleep, as described by Verywell Health.
—Moná Thomas, PEOPLE, 26 Dec. 2025
It’s also made with a strengthening blend of amino acids and violet pigments.
—Jenny Berg, Vogue, 26 Dec. 2025
See All Example Sentences for amino acid
Cite this Entry
“Amino acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/amino%20acid. Accessed 1 Jan. 2026.
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