biological value

noun
the nutritional effectiveness of the protein in a given food, expressed as the percentage used by the body of either the total protein consumed or the digestible protein available.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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It is a rare and outstanding ecosystem with exceptional biological value.
While small in area, these freshwater resources may be of significant biological value.
Habitat fragmentation involves the potential for dividing sensitive habitat and thereby lessening its biological value.
From fine-tuning muscular systems to integrating emotion and logic, the arts have important biological value.
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