SINCE 1828
nonessential amino acid
nounDefinition of nonessential amino acid
: any of various amino acids that are required for normal health and growth, that can be synthesized within the body or derived in the body from essential amino acids, and that include alanine, asparagine, aspartic acid, cystine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine — compare essential amino acid
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