essential amino acid

noun Biochemistry.

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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Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Essential amino acid is always a great word to know.

So is methionine. Does it mean:

nonessential amino acid produced by the hydrolysis of asparagines and proteins

found in casein wool and other proteins

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American Heritage

Medical Dictionary

essential amino acid n.
An alpha-amino acid that is required for protein synthesis but cannot be synthesized by humans and must be obtained in the diet.

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