An amino acid that an organism cannot synthesize and therefore has to be ingested as part of the diet. Of the 20 amino acids used in the human body, eight of them are 'essential.' They are lysine, threonine, methionine, isoleucine, leucine, valine, phenylalanine, and tryptophan. Two others, arginine...
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<biochemistry> Those amino acids that cannot be synthesised by an organism and must therefore be present in the diet. The term is often applied anthropocentrically to those amino acids required by humans (Ileu, Leu, Lys, Met, Phe, Thr, Try, & Val), though rats need two more (Arg & His). ... (18 Nov 1997) ...
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[
n] - an amino acid that is required by animals but that they cannot synthesize
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noun an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet
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One of the eight amino acids the human body cannot synthesize, and therefore a vital nutrient in the human diet.
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any amino acid that is required by an animal for growth but that cannot be synthesized by the animal's cells and must be supplied in the diet.
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