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 WordNet Dictionary |
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| | Definition: | | [n] an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet |
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| | See Also: | | amino acid, aminoalkanoic acid, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, tryptophane, valine |
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| Biology Dictionary |
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| | Definition: | | Any amino acid that can't be synthesized by an organism and must be taken in as a nutrient; in humans, about half of the 20 amino acids we use for growth and metabolism are essential. |
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