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WordReference Random House Learner's Dictionary of American English © 2024a•mi•no ac•id /əˈminoʊ ˈæsɪd/USA pronunciation n. [countable]- Biochemistrya compound that is one of the building blocks from which proteins are constructed.
WordReference Random House Unabridged Dictionary of American English © 2024ami′no ac′id, [Biochem.]- Biochemistryany of a class of organic compounds that contains at least one amino group, –NH2, and one carboxyl group, –COOH: the alpha-amino acids, RCH(NH2)COOH, are the building blocks from which proteins are constructed. Cf. essential amino acid.
Collins Concise English Dictionary © HarperCollins Publishers:: amino acid n - any of a group of organic compounds containing one or more amino groups, -NH2, and one or more carboxyl groups, -COOH. The alpha-amino acids RCH(NH2)COOH (where R is either hydrogen or an organic group) are the component molecules of proteins; some can be synthesized in the body (nonessential amino acids) and others cannot and are thus essential components of the diet (essential amino acids)
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