/ Dictionary / Index B biological value: Meaning and Definition of Find definitions for: biolog'ical val'ue Pronunciation: [key] 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biological rhythm biological warfare Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language